feat: add iii-sensor worker

[rohitg00]

Summary

• Code quality feedback sensor with 6 functions
• Scan directories, compute quality scores (geometric mean across 5 dimensions), detect degradation
• All through iii primitives: State, Queue, HTTP triggers
• 17 tests, 0 warnings

Functions

Function	Description
sensor::scan	Walk directory, compute per-file metrics
sensor::score	Weighted geometric mean -> 0-100 score + letter grade
sensor::baseline	Save current score as pre-session snapshot
sensor::compare	Diff current vs baseline, flag degradation
sensor::gate	CI pass/fail based on thresholds
sensor::history	Historical scores with trend detection

Test plan

• cargo test — 17 tests passing
• cargo check — 0 warnings

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7e130595-3659-424f-b74c-5b87b741923c

📥 Commits

Reviewing files that changed from the base of the PR and between 606a4d4 and c0421c5.

📒 Files selected for processing (17)

• sensor/Cargo.toml
• sensor/README.md
• sensor/SPEC.md
• sensor/build.rs
• sensor/config.yaml
• sensor/src/analysis.rs
• sensor/src/config.rs
• sensor/src/functions/baseline.rs
• sensor/src/functions/compare.rs
• sensor/src/functions/gate.rs
• sensor/src/functions/history.rs
• sensor/src/functions/mod.rs
• sensor/src/functions/scan.rs
• sensor/src/functions/score.rs
• sensor/src/main.rs
• sensor/src/manifest.rs
• sensor/src/state.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/sensor

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