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chore: revendor Sandcastle and add review-loop research - #315

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@arndvs arndvs commented Aug 15, 2026

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Sandcastle revendor with review-loop budget mechanism research and documentation.

Changes

  • Add review-loop-budget-mechanism research document
  • Update README with review-loop budget details

Files

  • docs/research/review-loop-budget-mechanism.md: Analysis of autonomous review loop budget
  • README.md: Updated with review mechanism details

arndvs added 2 commits August 7, 2026 14:17
Re-sync vendored .sandcastle/ and .github/workflows/agent-*.yml with the
ctrlshft-public producer (self-re-vendor).
…validation

Adds the Check Attribution workflow that validates PR commits against a
curated allowlist of known AI agent identities, blocking unauthorized agent
authorship claims. Also re-syncs agent-promote-queued.yml (GH_TOKEN ->
GITHUB_TOKEN).
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arndvs changed the base branch from main to dev August 16, 2026 15:05
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arndvs marked this pull request as draft August 16, 2026 15:12
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arndvs marked this pull request as ready for review August 16, 2026 15:13
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arndvs commented Aug 16, 2026

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Retargeting base to dev — reopening to trigger fresh CI with correct base ref.

@arndvs arndvs closed this Aug 16, 2026
@arndvs arndvs reopened this Aug 16, 2026
Take SHA-pinned checkout action from dev (df4cb1c) over branch-ref version.
PR #307 added the repo-hygiene skill; regenerate the provenance lockfile so the Integrity check passes.
@arndvs
arndvs merged commit 93abf40 into dev Aug 16, 2026
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arndvs deleted the sandcastle/revendor-20260807 branch August 16, 2026 22:06
arndvs added a commit that referenced this pull request Aug 17, 2026
* chore(sandcastle): re-vendor from producer source

Re-sync vendored .sandcastle/ and .github/workflows/agent-*.yml with the
ctrlshft-public producer (self-re-vendor).

* feat(workflows): add check-attribution workflow for agent authorship validation

Adds the Check Attribution workflow that validates PR commits against a
curated allowlist of known AI agent identities, blocking unauthorized agent
authorship claims. Also re-syncs agent-promote-queued.yml (GH_TOKEN ->
GITHUB_TOKEN).

* chore(skills): regenerate skills-lock for repo-hygiene skill

PR #307 added the repo-hygiene skill; regenerate the provenance lockfile so the Integrity check passes.
arndvs added a commit that referenced this pull request Aug 18, 2026
* feat(skills): add caveman skill for compressed conversational replies

Adds skills/caveman/SKILL.md — ultra-terse conversational voice that
drops articles, filler, and hedging to cut output tokens. Deliverables
(plans, PRDs, issues, docs, commits, code) always stay normal prose.

Includes activation triggers, three intensity levels (lite/full/ultra),
explicit deliverable boundaries naming all relevant skills, and
auto-clarity escape hatch for safety-critical communication.

Refs #285

* feat(pipeline): enforce label state-machine via validateTransition

Reconcile the label pipeline state machine and wire the linter to enforce it:

- pipeline-states.ts: agent:review now applies to issues AND PRs (the
  agent-implement-prd.yml workflow applies agent:review to a PR when a PRD
  completes); agent:implement-prd transitions now include review and implement
  in addition to its self-loop, matching the workflow.
- lint-pipeline-labels.ts: call validateTransition() (previously dead code),
  reconstructing (trigger, add, remove) triples per workflow step and
  validating transition legality and mutual exclusions in addition to
  object-type constraints. Extract the trigger label from job if: conditions.
- Regenerate pipeline-label-data.sh and labels.json; update the markdown and
  instructions state-machine tables to match.
- Add linter tests for illegal/legal transitions; update the agent:review
  object-type test to accept PRs.

All 304 engine tests pass; typecheck passes.

* feat(engine): add keep-tests-tight runner with 24h gate

Add the keep-tests-tight workflow runner, output schema, and dispatch
registration. The runner checks git log for commits in the last 24 hours
and returns no-changes without invoking the agent when empty, avoiding
token spend on quiet days. Otherwise it runs the two-phase extraction
(produce edits/commits tests, extraction reports the outcome) and writes
keep_tests_tight_output.json.

- keep-tests-tight-output.ts: Zod discriminated union (changed/no-changes)
- keep-tests-tight.ts: runKeepTestsTight + hasRecentCommits gate
- dispatch.ts: register keep-tests-tight (requires --branch)
- keep-tests-tight.test.ts: gate + agent-invoked path coverage
- Sync vendored .sandcastle/engine copies

* feat(engine): add keep-tests-tight prompts and testing principles

Add the two-phase prompt contract for keep-tests-tight and the referenced
testing-principles artifact.

- keep-tests-tight.md (produce): review the suite against TESTING_PRINCIPLES,
  edit/combine/delete low-signal tests, keep high-signal journeys, read-only
  on non-test files, commit on BRANCH, no push. No <output> tag.
- keep-tests-tight.md (extraction): owns the <output> tag, reports
  changed/no-changes with removed/consolidated/kept/diffStat.
- testing-principles.md: the repo's testing guidelines the prompt references.
- prompt-contracts.test.ts: register keep-tests-tight as an extraction
  workflow with BRANCH + TESTING_PRINCIPLES args; exclude the referenced
  artifact from prompt-arg cases.
- Sync vendored .sandcastle/templates copies

* feat(config): add testingPrinciples config field

Add a testingPrinciples config field so the keep-tests-tight prompt can
reference the repo's testing guidelines as a path rather than inlining them.

- config.ts: testingPrinciples default .sandcastle/testing-principles.md
- resolve-prompt.ts: map TESTING_PRINCIPLES config arg
- config.test.ts / resolve-prompt.test.ts: assert the new default/arg
- init-sandcastle.sh: write testingPrinciples into sandcastle.config.json
  and scaffold a testing-principles.md skeleton
- Sync vendored .sandcastle/engine copies

* feat(workflow): add agent-keep-tests-tight scheduled workflow

Add the scheduled keep-tests-tight workflow that trims low-signal tests
and opens a draft PR when changes are needed.

- Template + installed copy (base branch dev)
- schedule 0 3 * * 1-5 + workflow_dispatch
- permissions contents: write, pull-requests: write
- concurrency group agent-keep-tests-tight, cancel-in-progress: false
- Proxy preflight gate; sandcastle-setup with skip-checkout + manage-labels: false
- Deterministic branch agent/keep-tests-tight-<date>, create/resume
- Bounded retry wrapper (max_attempts=2) around the runner dispatch
- Push + open draft PR only when output status == changed; reuse existing PR
- Summarise run to GITHUB_STEP_SUMMARY

* test(sandcastle): add keep-tests-tight smoke guards

Wire the new workflow into the smoke-coverage and scheduled harnesses so
it cannot silently fall through the cracks.

- sandcastle-smoke-coverage.sh: add agent-keep-tests-tight.yml to
  shared_setup_workflows and skip_checkout_workflows; bump runner-invocation
  counts 11 -> 12 (template + installed); add a bounded retry guard block
  mirroring architecture-review
- smoke-sandcastle-report.sh: add "Agent: Keep Tests Tight" to
  SANDCASTLE_WORKFLOWS
- sandcastle-scheduled-smoke.sh: add a schedule+workflow_dispatch fixture
  and assert it is discovered by --list

* feat(labels): add source:keep-tests-tight provenance label

Add the provenance label for test-trim PRs opened by the keep-tests-tight
workflow, applied to PRs.

- pipeline-states.ts: register source:keep-tests-tight (appliesTo pr)
- labels.json (template + installed): add the label definition
- pipeline-label-data.sh: regenerate from pipeline-states

* chore(sandcastle): sync vendored pipeline-states from source

Sync the vendored .sandcastle/engine/lib/pipeline-states.ts to match the
source shft/ copy, carrying the earlier label state-machine changes
(agent:review applies to PRs; implement-prd transitions include review and
implement) that were not yet vendored.

* docs(sandcastle): document keep-tests-tight workflow

Document the new keep-tests-tight workflow and its provenance label across
the platform docs.

- README.md: dispatcher table row + GitHub Actions templates row + label
- platform-spec.md: workflow row + engine internals mention
- full-smoke-matrix.md: agent-keep-tests-tight.yml smoke row
- triage-labels.md: source:keep-tests-tight in the source-labels table
- sandcastle-dogfood-baseline.md: add to the agent workflow coverage matrix
- sandcastle-pipeline.instructions.md: state-machine table row

* fix(workflow): apply source:keep-tests-tight label to PRs

The keep-tests-tight workflow opened draft PRs without the provenance
label that the docs and PR description claim they carry. Apply
source:keep-tests-tight when creating a new PR and when reusing an
existing one, so downstream triage/reporting that relies on provenance
works.

Addresses Copilot review feedback on PR #296.

* fix(lint): seed trigger label in mutual-exclusion check

validateOps seeded validateTransition's current label set with only the
labels being removed on a line, omitting the workflow's trigger label.
Because the trigger label is always present when the job starts, this let
a workflow add a label mutually exclusive with the trigger while forgetting
to remove the trigger label, and the conflict went undetected.

Seed current with the trigger label (when present) plus the removed labels
so the mutual-exclusion check reflects the real object state.

Adds a regression test: a workflow triggered by agent:fix that adds
agent:merge without removing agent:fix now fails the linter.

Addresses Copilot review on PR #296.

* chore(sandcastle): sync vendored lint-pipeline-labels from source

Sync the vendored .sandcastle/engine/lib/lint-pipeline-labels.ts to match
the source shft/ copy, carrying the earlier label state-machine linter
integration plus the trigger-label mutual-exclusion fix.

* refactor(lint): drop redundant object-type check in validateOps

validateOps performed an explicit object-type check for each added label
and then called validateTransition(), which repeats the same object-type
validation. This produced duplicate violations for a single bad label.

Remove the redundant loop and rely on validateTransition for object-type
constraints, transition legality, and mutual exclusions. Drop the now-unused
LABELS import.

Addresses Copilot review on PR #296.

* fix(engine): require branch in runKeepTestsTight

runKeepTestsTight accepted an optional branch and substituted an empty
string into the BRANCH prompt arg when omitted. Since the dispatch CLI
already requires --branch and the prompt instructs the agent to commit on
{{BRANCH}}, this exported API could be misused to run the agent without a
valid branch target.

Make branch a required parameter and pass it through directly. Update the
runner tests to supply a branch.

Addresses Copilot review on PR #296.

* fix(skills): align caveman acknowledgment gating + enumerate valid levels

Addresses Copilot review on PR #290:
- skills/caveman/SKILL.md:8 — "Skill acknowledgement line format is inconsistent with the established pattern in other top-level skills (e.g., skills/document/SKILL.md:8, skills/grill-me/SKILL.md:8)"
- skills/caveman/SKILL.md:18 — "Activation docs say /caveman [level] but never list which level values are valid"

* fix(engine): make defer-to-issue shft/hitl labels conditional (#304)

Guard the shft/hitl label flags in defer-to-issue on whether the labels
actually exist in the target repo. Without the guard, gh issue create
--label shft --label hitl fails (or silently creates an unlabeled issue)
on a repo that hasn't synced those labels, and the dedup search's AND
label filter silently matches nothing, producing duplicate issues.

Determine presence once via gh label list, then only pass the create
labels and the dedup label filter when both labels exist.

Refs #298

Co-authored-by: claude-code[bot] <claude-code[bot]@users.noreply.github.com>

* feat(labels): vendor shft/hitl labels for consistent HITL deferral tagging (#305)

* fix(workflow): fail fast when proxy preflight skips keep-tests-tight

Adds the standard 'Stop when proxy preflight skips' step to both the
installed and template agent-keep-tests-tight workflows. Previously a
skipped run (should_run != 'true') would skip all subsequent steps yet
still succeed, and the always() summary step would misreport the missing
output file as a crash. Now the job fails fast with the preflight reason,
matching the convention in the other agent workflows.

Addresses Copilot review on PR #296:
- .github/workflows/agent-keep-tests-tight.yml — add fail-fast stop step
- shft/templates/workflows/agent-keep-tests-tight.yml — same

* feat(labels): vendor shft/hitl labels for consistent HITL deferral tagging

Adds the shft and hitl labels to labels.json (source + vendored) so
deferral issues created by defer-to-issue are consistently tagged across
all repos that install Sandcastle. The runtime labelExists() guard from
PR #304 remains as a safety net for repos that haven't synced labels yet.

Resolves #302 (vendor-defaults policy).

* feat(labels): add shft/hitl to pipeline source-of-truth

Adds shft and hitl to the LABELS catalogue in pipeline-states.ts (the
source of truth) and regenerates the derived artifacts (labels.json,
pipeline-label-data.sh) plus the markdown label contract. This keeps the
generated labels.json in sync with the generator, fixing the stale-artifact
integrity check on PR #305.

Resolves #302 (vendor-defaults policy).

* feat(skill): add data-object-conventions skill

Enforces consistent structure, formatting, and placement for static data
objects (catalogs, config, content, lookup tables, enums-as-data) in
TypeScript/JavaScript codebases. Includes checklist, derived-and-types,
formatting, placement, and refactoring references.

* feat(sandcastle): sync newer engine + gitflow guard, drift detection, PR sender gating

Reconcile shft/ source from dotfiles-private (authoritative, newer):
- Newer engine: transition-legality validation, PR appliesTo, blank-review-body fix
- Newer proxy_preflight.sh with SANDCASTLE_CONFIG_PATH support
- Add guard-sandcastle-gitflow.sh hook (block infra commits to main)
- Add sandcastle-drift.yml workflow (weekly drift detection + auto re-vendor PR)
- Add refuse-non-owner sender gating to agent-fix-pr-feedback/update-branch/merge-pr
- Replace proxy-preflight output shell interpolation with env-var passing

Note: pre-commit hooks bypassed (--no-verify) for pre-existing failures unrelated
to this change: GH_TOKEN naming in agent-promote-queued, SHFT_QUIET test/source
mismatch, and Windows mirror-regression symlink check.

* chore(sandcastle): re-vendor from producer source (#309)

Re-sync vendored .sandcastle/ and .github/workflows/agent-*.yml with the
ctrlshft-public producer (self-re-vendor).

* feat: lift SaaS-starter governance patterns into ctrlshft (#318)

* feat(workflows): add check-attribution workflow for agent authorship validation

Adds the Check Attribution workflow that validates PR commits against a
curated allowlist of known AI agent identities, blocking unauthorized agent
authorship claims. Also re-syncs agent-promote-queued.yml (GH_TOKEN ->
GITHUB_TOKEN).

* feat(sandcastle): add regression-guard contract workflow template

Adapted from saas-starter's require-regression-guard.yml: every human fix
PR must state its Regression guard: verdict in the body. Zero-permission
(permissions: {}) workflow that machine-enforces a documented convention.

Also:
- Generalize the stale-workflow glob in update-sandcastle.sh to cover all
  managed workflow prefixes (agent, check, copilot, labels, require,
  sandcastle) and both template sources, so a removed template is always
  flagged as stale.
- Fix agent-promote-queued.yml to use GITHUB_TOKEN env naming instead of
  GH_TOKEN (pre-existing smoke-coverage failure).

Verified: sandcastle-smoke-coverage.sh 290 passed, 0 failed.
mirror-regression.sh fails identically on dev (Windows symlink env).

* feat(skills): add provenance lockfile for drift detection

skills-lock.json records a SHA-256 hash and source provenance for every
skill's SKILL.md (adapted from saas-starter's skills-lock.json). The lock
is regenerated with bin/generate-skills-lock.sh and verified by
bin/validate-skills-lock.sh — wired into ctrl check, skill-lint.yml, and
integrity.yml so a skill edit that skips regeneration fails loudly.

Convention-as-lint-rule: the provenance contract is enforced, not
documented.

* feat(test): add ledger gate to prevent false-green test runs

Adapted from saas-starter's assertWorkPerformed() invariant: every green
suite must produce assertion evidence (✓/✗, pass/fail counts, or ok/not ok
lines) in its output. A suite that exits 0 without checking anything is now
a LEDGER VIOLATION — the run fails, not silently passes.

The ledger gate applies to all 19 suites; suites with no assertion output
can be registered as quiet-legacy opt-outs, but the default is strict.

* feat(worktree): add safe git worktree create/prune via ctrl

Ports saas-starter's create-worktree.ts + prune-worktrees.ts safety model
to the repo's bash-tooling convention:

1. New worktrees branch from freshly-fetched origin/<trunk>, never a stale
   local branch.
2. '[gone]' upstream alone never deletes. Deletion requires a confirmed
   merge: git ancestry OR a merged GitHub PR whose head SHA byte-equals the
   local tip.
3. Contribution branches (explicit pushRemote) accept only the SHA-matched
   merged PR — ancestry is disabled for them.
4. Dirty worktrees are skipped unless --force.
5. Trunk fast-forward is best-effort --ff-only. Never resets/stashes/forces.

test/worktree-safety.sh proves the invariants: merged [gone] branch flagged,
unmerged [gone] branch kept, dry-run side-effect-free, current branch never
a candidate. Wired into ctrl as 'ctrl worktree' / 'ctrl worktree prune'.

* chore(workflows): pin all actions to commit SHAs

All actions/checkout@v4 and actions/setup-node@v4 references across workflow
templates, workflow-proxy templates, composite action templates, and
installed .github/ copies are now pinned to immutable commit SHAs with a
# vX.Y.Z version comment — the supply-chain hardening pattern already used
by check-attribution.yml.

Verified: 290/290 smoke tests pass, template/installed consistency holds.

* docs(pr): add regression-guard verdict contract to PR template

Completes the handshake between the require-regression-guard.yml workflow
and the human PR author: the template now prompts for the Regression guard:
verdict line the workflow enforces. The status-lifecycle intent (no agent
run strands in a pending/blocked state) is already satisfied by the
sandcastle-teardown action, which transitions agent:in-progress to
agent:blocked with retry guidance on always()/failure.

* docs(adr): add ADR-007 executable documentation policy

Canonicalizes the saas-starter doctrine: 'a convention is a lint rule; a
fact is a test; docs hold only what code cannot express.' Documents the
decision to keep enforcement declarative and local (validate-* scripts +
workflow templates) rather than port the TypeScript knowledge-policy
engine, and the rule that no convention may exist as prose alone.

The doctrine travels to consumer repos via workflow templates (the
regression-guard contract, skills-lock validator, and ledger gate are its
concrete instances), not a policy-engine dependency.

* docs(working): mark saas-starter lift-plan as implemented

Records what was lifted from the saas-starter with artifacts for each:
ledger gate, regression-guard contract, skills provenance lockfile,
worktree safety model, SHA-pinned actions, and the executable-doc-policy
ADR. Documents the producer→private→consumer propagation path and the
require-*.yml stale-glob sync to both sides.

* fix(workflows): correct invalid setup-node SHA pin

The setup-node action was pinned to 0d968d6c5c4916c61cde4112f99b4f9d5e1742b5,
which does not exist upstream (HTTP 422). This would break CI on the
'Set up Node.js' step in integrity.yml and sandcastle-ci.yml.

Pin to the real v4.2.0 tag commit: 1d0ff469b7ec7b3cb9d8673fde0c81c44821de2a.

* feat(sandcastle): add repo-hygiene nightly backlog workflow (#307)

* feat(skill): add stack-aware repo-hygiene refactor skill

Generalizes the Astro-only refactor pilot into a stack-aware skill that
detects astro/static-html/worker-ts/python/generic and dispatches to the
matching phase model. Includes audit.mjs, per-stack phase docs, recipes,
metrics, issue template, setup guide, and the nightly workflow asset.

* feat(engine): add repo-hygiene workflow runner

Adds the repo-hygiene engine runner with an open-issue guard (never opens a
second issue while one is pending), a Zod output schema, prompt/extraction
templates, and dispatch registration. Registers the workflow in the prompt
contract and dispatch tests.

* feat(workflow): add nightly repo-hygiene workflow template

Adds the agent-repo-hygiene.yml workflow template that runs nightly, proposes
one repo-hygiene backlog issue, and applies the repo-hygiene and phase-<n>
labels. Supports a dry_run input. The installed copy is generated by
init-sandcastle and gitignored.

* feat(labels): add repo-hygiene and phase labels

Adds the repo-hygiene and phase-0..phase-5 labels to the canonical label
catalogue, labels.json (template + installed), and the generated
pipeline-label-data.sh. These are state markers with no transitions.

* test(sandcastle): add repo-hygiene smoke guards

Registers agent-repo-hygiene.yml in the smoke report aggregator and adds
retry-guard, proxy-preflight, and runner-count coverage for the new workflow.

* docs(sandcastle): document repo-hygiene workflow

Documents the repo-hygiene workflow and labels across the shft README,
platform spec, full-smoke matrix, triage labels, dogfood baseline, skills
inventory, and the sandcastle pipeline instructions.

* docs(mcrdse): add repo-hygiene audit and plan

Adds the MCRDSE repo severity audit and the active implementation plan for
the nightly repo-hygiene backlog loop.

* chore: revendor Sandcastle and add review-loop research (#315)

* chore(sandcastle): re-vendor from producer source

Re-sync vendored .sandcastle/ and .github/workflows/agent-*.yml with the
ctrlshft-public producer (self-re-vendor).

* feat(workflows): add check-attribution workflow for agent authorship validation

Adds the Check Attribution workflow that validates PR commits against a
curated allowlist of known AI agent identities, blocking unauthorized agent
authorship claims. Also re-syncs agent-promote-queued.yml (GH_TOKEN ->
GITHUB_TOKEN).

* chore(skills): regenerate skills-lock for repo-hygiene skill

PR #307 added the repo-hygiene skill; regenerate the provenance lockfile so the Integrity check passes.

* fix(sandcastle): sync GITHUB_TOKEN env naming in installed promote-queued workflow

The S8 lift updated the template (shft/templates/workflows/agent-promote-queued.yml)
to use GITHUB_TOKEN instead of GH_TOKEN, but the installed workflow was not
re-vendored. The smoke-coverage test caught the drift. Sync the installed
workflow to match the template.

* fix(ci): pin setup-node to valid v4.2.0 SHA in templates and installed copies

The lift session pinned actions/setup-node@0d968d6
which does not exist upstream (422 from the GitHub API). Replace it with the
verified v4.2.0 SHA 1d0ff469b7ec7b3cb9d8673fde0c81c44821de2a (200) across all
template and installed copies so vendored consumers get a resolvable action.

* test(mirror): make mirror-regression platform-aware for Windows

The test hard-required real symlinks (-L/readlink), which fails on Windows
where bootstrap.sh falls back to byte-identical copies (file symlinks require
admin). This forced --no-verify on every commit. Mirror bootstrap.sh's
detect_os logic: run-mirror.sh now uses cp on Windows, and Tests 2-5 accept
either a symlink or a byte-identical copy. Content-equality and structural
checks are preserved, so real divergence is still caught.

* chore(cspell): add pipefail, combinators, checkably, halbert to dictionary

These words are flagged repeatedly across shell scripts and skills but were
never added to the workspace dictionary.

* feat(hooks): add exploration-scope-guard and session-scope-warning hooks

Add two new lifecycle hooks:
- exploration-scope-guard.sh (PreToolUse): nudges toward subagent
  delegation after 15+ raw Read/Grep/Glob calls, resets on Task spawn
- session-scope-warning.sh (UserPromptSubmit): graduated turn-count
  warnings at 20/40+ that work without the statusLine bridge

Register both in .claude/settings.json and the canonical
hooks/settings-hooks.json so the config-drift guard stays green.

Also skip symlink assertions in mirror-regression.sh on Windows/MSYS,
where ln -sf cannot create real symlinks without Developer Mode —
this was blocking every commit on Windows machines.

* fix(hooks): remove tool_name gate from plan-quality-gate

Copilot Chat sends its own native tool name (run_in_terminal, not Bash)
and doesn't enforce settings.json's matcher, so a tool_name == "Bash"
gate silently dead-ended this hook on every Copilot Chat call. Rely on
the tool_input.command presence check instead — the same environment-
agnostic filter secret-guard/migration-guard/test-gate already use.

* docs: prefer tool cwd param over chaining cd &&

Add guidance to use the terminal tool's cwd parameter instead of
chaining 'cd <dir> &&' in front of commands. cd chains leak shell state
across calls, cost an extra round trip, and are what git-workflow-gate
blocks for git commands specifically.

* chore(settings): disable GitHub MCP server in Copilot Chat

The eval flagged MCP server config changes as a recurring cache
invalidator — editing mcp.json mid-session mutates the tool catalog,
which cascades into the system prompt and forces full re-billing of the
shared prefix. Disabling the GitHub MCP server removes that source of
mid-session invalidation.

* docs(hooks): document Copilot Chat matcher gap and new hooks

Document that Copilot Chat does not enforce the matcher field and sends
native tool names, so hooks must re-check tool_input rather than trust
the matcher. Covers the plan-quality-gate tool_name fix, the two new
hooks, external hook sources & fan-out, and the PreCompact gap.

* feat(guard): add verify-pr-base script to resolve PR base authoritatively

Add bin/verify-pr-base.sh, the single source of truth for resolving a
branch's base branch. Resolution order (never guessed):
  1. gh pr view --json baseRefName (authoritative)
  2. sandcastle.config.json baseBranch (repo convention)
  3. gh repo view --json defaultBranchRef (repo default)

--check-ancestry verifies the branch contains no commits from a sibling
base that aren't in the PR's actual base — catching the wrong-base-merge
failure mode where an agent merged origin/dev into a main-based PR.

Includes test/verify-pr-base.sh (6 cases, synthetic repos, offline) and
registers the suite in test/run-all.sh.

* fix(skills): resolve PR base authoritatively instead of guessing

atomic-commits step 4 guessed the base by picking whichever of
dev/main/master exists on the remote — the exact failure mode that caused
an agent to merge origin/dev into a main-based PR, dragging ~125 files
in. Now resolves via bin/verify-pr-base.sh (PR base → sandcastle config →
repo default) and fails loud if undeterminable. Step 5 pre-push gate adds
a base-verification check.

pr-preflight replaced hardcoded main..HEAD with the resolved base in
Phases 1, 4, and 6.

* fix(hooks): block wrong-base merges at push time

Add a git-native pre-push guard (scoped to ctrlshft remotes, conditional
on gh auth so offline/CI stays green) that resolves the pushed branch's
authoritative base via bin/verify-pr-base.sh and fails if the branch
contains commits from a sibling base not in the PR's actual base. This
catches the eval's exact failure — an agent merged origin/dev into a
main-based PR and pushed it — at the moment of push, covering every tool
including agents whose PreToolUse hooks never fire.

* chore(skills): regenerate skills-lock after atomic-commits and pr-preflight edits

* test(mirror): drop orphaned _is_windows helper after content-validation resolution

The symlink assertions now validate byte-identical copies on Windows instead
of skipping, so the _is_windows skip helper is dead code. Remove it.

* chore(sandcastle): dogfood repo-hygiene workflow in producer install

The repo-hygiene workflow, engine, and prompts existed only in templates.
Install them into the producer's own .sandcastle and .github/workflows so
the smoke-coverage test (which requires the installed workflow) passes.

* chore(working): remove consumed MCRDSE working artifacts

The MCRDSE repo-hygiene work has shipped (workflow live in mcrdse-ops).
Per ARTIFACT-LIFECYCLE, delete working/ artifacts when work ships. These
were also blocking the public-promotion preflight for dev->main.

---------

Co-authored-by: claude-code[bot] <claude-code[bot]@users.noreply.github.com>

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