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-monitor/scripts/reconcile.sh

@@ -16,7 +16,7 @@ set -euo pipefail
 
 source "$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)/lib.sh"
 
-STATE_DIR="${AGENT_SESSIONS_STATE_DIR:-$HOME/.cache/tmux-agent-orchestrate-monitor}"
+STATE_DIR="${AGENT_SESSIONS_STATE_DIR:-$WORKSPACE_ROOT/.cache/tmux-agent-orchestrate-monitor}"
 
 ONCE=0
 EMIT_DIFF=0
@@ -54,7 +54,7 @@ if [ "$SUBSCRIBE" = "1" ]; then
 
   # The MQTT subscribe loop exits 3 to signal "broker unavailable → poll instead".
   set +e
-  YAML_PATH="$AGENT_SESSIONS_YAML" HOME_DIR="$HOME" \
+  YAML_PATH="$AGENT_SESSIONS_YAML" HOME_DIR="$HOME_DIR" CLAUDE_PROJECT_DIR="$CLAUDE_PROJECT_DIR" LOCAL_BIN="$LOCAL_BIN" \
     SUB_TIMEOUT="$SUB_TIMEOUT" SUB_IDLE_TIMEOUT="$SUB_IDLE_TIMEOUT" \
     SKILLS_DIR="$SKILLS_DIR" LIB_SH="$LIB_SH" \
     "$PYBIN" - <<'PYEOF'
@@ -229,6 +229,7 @@ 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")
 
 now_iso = datetime.now(timezone.utc).strftime('%Y-%m-%dT%H:%M:%SZ')
 
@@ -374,7 +375,7 @@ for s in d.get('tmux_sessions', []):
     if not cwd:
         continue
     proj_key = cwd.replace('/', '-').replace('_', '-')
-    proj_dir = f"{home}/.claude/projects/{proj_key}"
+    proj_dir = f"{claude_project_dir}/{proj_key}"
     if not os.path.isdir(proj_dir):
         continue
     jsonls = sorted(glob.glob(f"{proj_dir}/*.jsonl"), key=os.path.getmtime, reverse=True)
@@ -426,7 +427,7 @@ ai = d.get('agent_identities', {}) or {}
 cl = (ai.get('claude') or {})
 if cl.get('session_id'):
     sid = cl['session_id']
-    if not glob.glob(f"{home}/.claude/projects/*/{sid}.jsonl"):
+    if not glob.glob(f"{claude_project_dir}/*/{sid}.jsonl"):
         drifts.append({'class': 'D', 'name': '(claude identity cache)',
                        'msg': f"stale UUID in agent_identities.claude.session_id: {sid} (jsonl missing)"})
 ag = (ai.get('agy') or {})