feat: implement ADR-128 wiring, ADR-129 hook, ADR-130 learning extraction

[notque]

Summary

Implements three independent ADRs from the post-127/128 rollout follow-up:

• ADR-129: hooks/posttool-rename-sweep.py — PostToolUse hook that detects git mv commands and greps for stale references to old filenames across .py/.json/.md/.yaml/.yml files. Prevents the class of bug that broke 83 tests during ADR-118 renames.
• ADR-130: skills/pause-work/SKILL.md — New Phase 3 (EXTRACT LEARNINGS) queries learning-db.py for session insights, filters ADR-worthy decisions using a decision-vs-tip heuristic, and drafts skeleton ADRs with Proposed status. Renumbers subsequent phases (4: WRITE, 5: CONFIRM).
• ADR-128 wiring: Connects joy-check --mode instruction into skill-creation-pipeline (Phase 4, Step 3) and agent-upgrade (Phase 4, Step 3) so new/modified skills and agents are automatically validated for positive framing.

All three were implemented by parallel agents with file partitioning (non-overlapping files, no worktrees needed).

Review fixes applied

• Hook regex updated to handle git mv -f/--force flags and quoted paths with spaces
• Hook now checks tool_result.is_error to skip failed git mv commands
• Added --include=*.yml, minimum stem length guard (3 chars), and self-match filtering
• Resolved contradictory blocking guidance in skill-creation-pipeline (joy-check is advisory)
• Renumbered Step 2.5 → Step 3 in agent-upgrade for consistency

Test plan

• Hook Python syntax validates (py_compile)
• Hook regex tested: simple, paths, chained, flags (-f, --force), quoted spaces
• Hook is_error guard, stem length guard, self-match filter verified
• Pause-work phases correctly renumbered (3→4→5), gates present
• Pipeline joy-check steps inserted at correct locations
• All step numbering consistent (no fractional steps)