test(browser): record controlled Agent Task resource evidence

[seonghobae]

Partial implementation of #28, stacked on PR #71.

Buyer-visible gap

Issue #28 requires real browser/task RSS, observation bytes, action latency and task duration. PR #70/#71 prove real pinned-Chromium task execution plus browser-computed role/name evidence, but the runtime evidence previously lacked measured resource fields.

Dependency / current stack

This Draft now targets exact current PR #71 head f82a3b27243adbb14c28af22d408a25cb3c296e9; current exact #72 head is e0b5d43c3a869605aaefa2e4752de7b1b641ddbd. The branch has already been aligned to the moved prerequisite and GitHub reports it mergeable against that exact base. Keep Draft while #71/#70/#65 remain active. No prerequisite check, review, status, or mergeability evidence transfers.

TDD / implemented boundary

1. Exact test-only head a9402a13c9ed429b8f3be2c623b994a0dfda3bb4 required strict Linux /proc/<pid>/status RSS parsing/sampling, ChromeDriver-issued goog:processID, and bounded browser_process_rss_bytes, semantic_observation_bytes, action_latency_ms, and task_duration_ms evidence.
2. CI run 31454745237, Rust contracts job 93666110420, checked out that exact test-only head and failed at the intended repository contract because _parse_linux_proc_status_rss_bytes did not exist. This is the observed RED boundary.
3. The implemented boundary provides strict positive single-VmRSS parsing with unit/shape/u64 overflow rejection; bounded /proc/<pid>/status reads for the ChromeDriver-issued browser PID; exact UTF-8 JSON byte size for the two controlled role/name observations; monotonic clear/type/click action latency; and end-to-end task duration. Invalid/missing process identity or malformed resource evidence fails closed.
4. Current stack-alignment head e0b5d43c3a869605aaefa2e4752de7b1b641ddbd preserves that evidence behavior while descending from exact current test(browser): verify semantic role and name before controlled action #71 head f82a3b27243adbb14c28af22d408a25cb3c296e9.

Exact-head proof

On unchanged exact head e0b5d43c3a869605aaefa2e4752de7b1b641ddbd against exact current prerequisite #71 head f82a3b27243adbb14c28af22d408a25cb3c296e9:

• CI run 31549872719: success;
• Manifest V3 Compatibility run 31549872700: success;
• GitHub reports the Draft mergeable against its exact prerequisite base;
• no formal reviews are currently returned; and
• no inline review threads are currently returned.

No predecessor-head result is transferred.

Truth boundary

This lane is execution evidence only. browser_process_rss_bytes is intentionally narrower than task RSS: a single ChromeDriver-reported browser PID does not attribute Chromium renderer/GPU/utility descendants and must not be presented as whole-browser or whole-task RSS. Full multi-process attribution belongs to the separately stacked process-tree evidence lane and later trusted adapter/process-set composition with #51/#66. semantic_observation_bytes measures only the bounded controlled role/name evidence serialized by this runner; it is not raw DOM size, model-context cost, source-node/network provenance, or product SemanticNodeObservation composition. No GPU/VRAM/local-AI evidence, production browser adapter, policy dispatch, or real-site compatibility is claimed.

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