feat: pending instinct TTL pruning and /prune command (#725)

* feat: add pending instinct TTL pruning and /prune command

Pending instincts generated by the observer accumulate indefinitely
with no cleanup mechanism. This adds lifecycle management:

- `instinct-cli.py prune` — delete pending instincts older than 30 days
  (configurable via --max-age). Supports --dry-run and --quiet flags.
- Enhanced `status` command — shows pending count, warns at 5+,
  highlights instincts expiring within 7 days.
- `observer-loop.sh` — runs prune before each analysis cycle.
- `/prune` slash command — user-facing command for manual pruning.

Design rationale: council consensus (4/4) rejected auto-promote in
favor of TTL-based garbage collection. Frequency of observation does
not establish correctness. Unreviewed pending instincts auto-delete
after 30 days; if the pattern is real, the observer will regenerate it.

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

* fix: remove duplicate functions, broaden extension filter, fix prune output

- Remove duplicate _collect_pending_dirs and _parse_created_date defs
- Use ALLOWED_INSTINCT_EXTENSIONS (.md/.yaml/.yml) instead of .md-only
- Track actually-deleted items separately from expired for accurate output
- Update README.md and AGENTS.md command counts: 59 → 60

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

* fix: address Copilot and CodeRabbit review findings

- Use is_dir() instead of exists() for pending path checks
- Change > to >= for --max-age boundary (--max-age 0 now prunes all)
- Use CLV2_PYTHON_CMD env var in observer-loop.sh prune call
- Remove unused source_dupes variable
- Remove extraneous f-string prefix on static string

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

* fix: update AGENTS.md project structure command count 59 → 60

Co-Authored-By: Claude <noreply@anthropic.com>

* fix: address cubic and coderabbit review findings

- Fix status early return skipping pending instinct warnings (cubic #1)
- Exclude already-expired items from expiring-soon filter (cubic #2)
- Warn on unparseable pending instinct age instead of silent skip (cubic #4)
- Log prune failures to observer.log instead of silencing (cubic #5)

Co-Authored-By: Claude <noreply@anthropic.com>

* fix: YAML single-quote unescaping, f-string cleanup, add /prune to README

- Fix single-quoted YAML unescaping: use '' doubling (YAML spec) not
  backslash escaping which only applies to double-quoted strings (greptile P1)
- Remove extraneous f-string prefix on static string (coderabbit)
- Add /prune to README command catalog and file tree (cubic)

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Happy <yesreply@happy.engineering>

README.md

@@ -212,7 +212,7 @@ For manual install instructions see the README in the `rules/` folder.
 /plugin list everything-claude-code@everything-claude-code
 ```
 
-✨ **That's it!** You now have access to 28 agents, 116 skills, and 59 commands.
+✨ **That's it!** You now have access to 28 agents, 116 skills, and 60 commands.
 
 ---
 
@@ -388,6 +388,7 @@ everything-claude-code/
 |   |-- instinct-import.md  # /instinct-import - Import instincts (NEW)
 |   |-- instinct-export.md  # /instinct-export - Export instincts (NEW)
 |   |-- evolve.md           # /evolve - Cluster instincts into skills
+|   |-- prune.md            # /prune - Delete expired pending instincts (NEW)
 |   |-- pm2.md              # /pm2 - PM2 service lifecycle management (NEW)
 |   |-- multi-plan.md       # /multi-plan - Multi-agent task decomposition (NEW)
 |   |-- multi-execute.md    # /multi-execute - Orchestrated multi-agent workflows (NEW)
@@ -1083,7 +1084,7 @@ The configuration is automatically detected from `.opencode/opencode.json`.
 | Feature | Claude Code | OpenCode | Status |
 |---------|-------------|----------|--------|
 | Agents | ✅ 28 agents | ✅ 12 agents | **Claude Code leads** |
-| Commands | ✅ 59 commands | ✅ 31 commands | **Claude Code leads** |
+| Commands | ✅ 60 commands | ✅ 31 commands | **Claude Code leads** |
 | Skills | ✅ 116 skills | ✅ 37 skills | **Claude Code leads** |
 | Hooks | ✅ 8 event types | ✅ 11 events | **OpenCode has more!** |
 | Rules | ✅ 29 rules | ✅ 13 instructions | **Claude Code leads** |
@@ -1140,6 +1141,7 @@ OpenCode's plugin system is MORE sophisticated than Claude Code with 20+ event t
 | `/evolve` | Cluster instincts into skills |
 | `/promote` | Promote project instincts to global scope |
 | `/projects` | List known projects and instinct stats |
+| `/prune` | Delete expired pending instincts (30d TTL) |
 | `/learn-eval` | Extract and evaluate patterns before saving |
 | `/setup-pm` | Configure package manager |
 | `/harness-audit` | Audit harness reliability, eval readiness, and risk posture |