M2: router gate (LLM-judge classifier, fail-open) - #26
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Signed-off-by: Jannes Stubbemann <jannes.stubbemann@gmail.com>
Signed-off-by: Jannes Stubbemann <jannes.stubbemann@gmail.com>
Signed-off-by: Jannes Stubbemann <jannes.stubbemann@gmail.com>
Signed-off-by: Jannes Stubbemann <jannes.stubbemann@gmail.com>
…eline Signed-off-by: Jannes Stubbemann <jannes.stubbemann@gmail.com>
Signed-off-by: Jannes Stubbemann <jannes.stubbemann@gmail.com>
Add the metrics facade crate (0.24, matching chorus-server) to chorus-core and increment a counter labelled by profile name and decision branch (fuse/single) next to the existing tracing::info! call in Pipeline::run. The counter is a no-op without a recorder installed, so existing tests are unaffected. Signed-off-by: Jannes Stubbemann <jannes.stubbemann@gmail.com>
…s, boundary test - Hoist metrics = "0.24" into [workspace.dependencies]; replace direct pins in chorus-core and chorus-server with metrics.workspace = true (DRY). - Replace silent unwrap_or_else fallback in Pipeline::router_for "classifier" arm with an if-let that emits tracing::warn! and returns AlwaysFuse when classifier_model is None (config validation normally prevents this, but the fallback now fails safe to higher-quality fusion rather than misusing single_model as the scorer). - Add /// doc comments to RouterConfig::classifier_model and ::threshold matching the style of nearby AggregatorConfig fields. - Add score_at_threshold_fuses test in classifier_tests: score == threshold routes to Fuse because the comparison is score < threshold (equality fuses). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Signed-off-by: Jannes Stubbemann <jannes.stubbemann@gmail.com>
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Summary
Adds the router gate, the M1 design's primary cost lever: a profile can route easy queries to a single model and fuse only the hard ones. Built TDD against
docs/plans/2026-06-18-m2-router-gate.md, each task independently reviewed plus a final whole-branch review.RouterConfiggainspolicy(always_fuse|classifier),classifier_model, andthreshold, with validation (policy known, model required for classifier, threshold in 0.0..=1.0, loop-guard covers the classifier model).ClassifierRouter: a cheap LLM-judge scores query difficulty 0..1; fuse if score >= threshold, else route to the single model. Fails OPEN to fusion on any backend error or unparseable score.Pipeline::newsignature unchanged sochorus-serverneeded no edits. Achorus_router_decisions_total{profile,decision}metric is emitted for both branches.metricshoisted to a workspace dependency.Deferred to the deploy track (needs live inference): threshold calibration on real traffic and the budget-panel sovereignty benchmark. The SearXNG tool adapter remains M2 scope, not in this PR.
Test Plan
cargo test --workspace(41 tests: 39 unit + 2 integration)cargo clippy --workspace --all-targets -- -D warningscleancargo fmt --all -- --checkcleancargo deny checkok🤖 Generated with Claude Code