refactor(skills): make skills portable across users/locations via workspace-relative paths + env var overrides

Changes:
- skills/lib.sh:
  - HOME_DIR default changed from $HOME to <workspace_root> (workspace self-sufficient)
  - Added CLAUDE_PROJECT_DIR / LOCAL_BIN env var pattern (default $HOME, overridable)
- skills/tmux-agent-orchestrate-monitor/scripts/reconcile.sh:
  - STATE_DIR moved from $HOME/.cache/... to <workspace>/.cache/tmux-agent-orchestrate-monitor
- skills/tmux-agent-orchestrate-create/scripts/create_session.sh:
  - WRAPPER uses $LOCAL_BIN env var (default $HOME/.local/bin)
- 6 SKILL.md: examples and explanations updated to mention env var override capability

User/portability contract:
- Workspace-internal data: .hermes/ + .cache/ (moves with workspace)
- User/system data: $HOME/* (overridable via CLAUDE_PROJECT_DIR, LOCAL_BIN)
- All env vars follow: ${VAR:-default} pattern with documented defaults

Verified on isolated server -L agy-homeport-test (kill-server after):
- syntax check PASS
- E2E: defaults resolve to workspace-relative paths
- E2E: env var override correctly changes paths
- 0 leftover direct $HOME references in code
- Global skill non-interference verified
- Main isolated server -L multi-agent-canary untouched

skills/tmux-agent-orchestrate-status/scripts/status.sh

@@ -34,6 +34,7 @@ import yaml
 
 yaml_path = os.environ['YAML_PATH']
 home = os.environ['HOME_DIR']
+claude_project_dir = os.environ.get('CLAUDE_PROJECT_DIR', f"{home}/.claude/projects")
 drift = json.loads(os.environ['DRIFT_JSON'])
 
 with open(yaml_path) as f:
@@ -53,9 +54,9 @@ def resume_on_disk(s):
         u = s.get('claude_session_id_own')
         if u:
             key = cwd.replace('/', '-').replace('_', '-')
-            return 'yes' if os.path.exists(f"{home}/.claude/projects/{key}/{u}.jsonl") else 'MISSING'
+            return 'yes' if os.path.exists(f"{claude_project_dir}/{key}/{u}.jsonl") else 'MISSING'
         key = cwd.replace('/', '-').replace('_', '-')
-        return 'scan' if glob.glob(f"{home}/.claude/projects/{key}/*.jsonl") else 'no'
+        return 'scan' if glob.glob(f"{claude_project_dir}/{key}/*.jsonl") else 'no'
     if name.endswith('-creator-agy'):
         u = s.get('agy_conversation_id_own')
         if u: