docs(tb-2ir): record tmux detector viability verdict in decisions.md

docs/notes/decisions.md

@@ -188,6 +188,8 @@ The adapter seam is validated: the daemon consumes normalized events from either
 
 ## Test Results (2026-07-02)
 
+**Source:** Bead `tb-1me` — Tmux Detector Acceptance Test
+
 ### Test Methodology
 
 **Acceptance Test**: Phase 7 Tmux Detector Acceptance Test (`test-tmux-detector.sh`)

notes/tb-2ir.md

@@ -0,0 +1,53 @@
+# Tmux Detector Viability Verdict (tb-2ir)
+
+## Task
+Record tmux detector viability verdict in decisions.md
+
+## What Was Done
+
+Reviewed test results from child bead `tb-1me` and verified that the decision entry in `docs/notes/decisions.md` already contains comprehensive viability findings.
+
+## Entry Review
+
+The existing "Tmux Detector Viability (2026-07-02)" section (lines 92-305) includes all required information:
+
+### ✓ Verdict Stated Explicitly
+**VIABLE — Works as designed**
+
+### ✓ Quantitative Metrics
+- **False positive rate**: Low (30s quiet threshold, prompt pattern matching, hash-based comparison)
+- **False negative rate**: User-dependent (requires @tb- opt-in, non-standard prompts)
+- **Performance impact**: Minimal (2s poll interval, <50ms per cycle for 10 panes, negligible CPU)
+
+### ✓ Tuning Parameters Documented
+| Parameter | Default | Configurable via |
+|-----------|---------|------------------|
+| Quiet threshold | 30000ms (30s) | `TRAILBOSS_QUIET_THRESHOLD_MS` |
+| Poll interval | 2000ms (2s) | `TRAILBOSS_POLL_INTERVAL_MS` |
+| Opt-in prefix | `@tb-` | `TRAILBOSS_OPT_IN_PREFIX` |
+| Prompt patterns | 11 patterns | (code) |
+
+### ✓ Test Results Included
+- Test methodology documented
+- Execution time metrics (55.2s avg duration, 0.84s std deviation)
+- Accuracy analysis (100% detection accuracy, 0 false positives, 0 false negatives)
+- Failure mode analysis (test infrastructure issue, not detector defect)
+- Conclusions and recommendations
+
+## Changes Made
+
+Added explicit reference to bead `tb-1me` in the test results section to link the decision to its source:
+- Line 191: Added "Source: Bead `tb-1me` — Tmux Detector Acceptance Test"
+
+## Conclusion
+
+The tmux detector viability verdict is fully documented in `docs/notes/decisions.md`. The detector is production-ready with:
+- Low false positive rate (mitigated by threshold and pattern matching)
+- User-dependent false negative rate (acceptable for fallback)
+- Minimal performance impact (negligible CPU overhead)
+- Clear tuning parameters and production enablement instructions
+
+---
+**Date**: 2026-07-02
+**Parent bead**: tb-2ir
+**Child bead**: tb-1me