Consolidate 36 per-change specs into 4 feature-level specs and align workflow

Replace granular change-level specs (001–036) with living feature specs:
- 001-combatant-management (CRUD, persistence, clear, confirm buttons)
- 002-turn-tracking (rounds, turn order, advance/retreat, top bar)
- 003-combatant-state (HP, AC, conditions, concentration, initiative)
- 004-bestiary (search, stat blocks, source management, panel UX)

Workflow changes:
- Add /integrate-issue command (replaces /issue-to-spec) for routing
  issues to existing specs or handing off to /speckit.specify
- Update /sync-issue to list specs instead of requiring feature branch
- Update /write-issue to reference /integrate-issue
- Add RPI skills (research, plan, implement) to .claude/skills/
- Create docs/agents/ for RPI artifacts (research reports, plans)
- Remove update-agent-context.sh call from /speckit.plan
- Update CLAUDE.md with proportional scope-based workflow table
- Bump constitution to 3.0.0 (specs describe features, not changes)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/skills/rpi-plan/scripts/metadata.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+"""Get git metadata for plan documents."""
+
+import json
+import subprocess
+import sys
+from datetime import datetime, timezone
+from pathlib import Path
+
+
+def run(cmd: list[str]) -> str:
+    result = subprocess.run(cmd, capture_output=True, text=True)
+    return result.stdout.strip() if result.returncode == 0 else ""
+
+
+def get_repo_name() -> str:
+    remote = run(["git", "remote", "get-url", "origin"])
+    if remote:
+        name = remote.rstrip("/").rsplit("/", 1)[-1]
+        return name.removesuffix(".git")
+    root = run(["git", "rev-parse", "--show-toplevel"])
+    return Path(root).name if root else Path.cwd().name
+
+
+def main() -> None:
+    metadata = {
+        "date": datetime.now(timezone.utc).isoformat(),
+        "commit": run(["git", "rev-parse", "HEAD"]),
+        "branch": run(["git", "branch", "--show-current"]),
+        "repository": get_repo_name(),
+    }
+    json.dump(metadata, sys.stdout, indent=2)
+    print()
+
+
+if __name__ == "__main__":
+    main()