fix: remove 115 verified dead code symbols across 46 production files

Automated dead code audit using vulture + coverage.py + ast-grep intersection,
confirmed by Opus deep verification pass. Every symbol verified to have zero
production callers (test imports excluded from reachability analysis).

Removes ~1,534 lines of dead production code across 46 files and ~1,382 lines
of stale test code. 3 entire files deleted (agent/builtin_memory_provider.py,
hermes_cli/checklist.py, tests/hermes_cli/test_setup_model_selection.py).

Co-authored-by: alt-glitch <balyan.sid@gmail.com>

tools/approval.py

@@ -258,30 +258,12 @@ def has_blocking_approval(session_key: str) -> bool:
         return bool(_gateway_queues.get(session_key))
 
 
-def pending_approval_count(session_key: str) -> int:
-    """Return the number of pending blocking approvals for a session."""
-    with _lock:
-        return len(_gateway_queues.get(session_key, []))
-
-
 def submit_pending(session_key: str, approval: dict):
     """Store a pending approval request for a session."""
     with _lock:
         _pending[session_key] = approval
 
 
-def pop_pending(session_key: str) -> Optional[dict]:
-    """Retrieve and remove a pending approval for a session."""
-    with _lock:
-        return _pending.pop(session_key, None)
-
-
-def has_pending(session_key: str) -> bool:
-    """Check if a session has a pending approval request."""
-    with _lock:
-        return session_key in _pending
-
-
 def approve_session(session_key: str, pattern_key: str):
     """Approve a pattern for this session only."""
     with _lock:
@@ -356,6 +338,7 @@ def clear_session(session_key: str):
             entry.event.set()
 
 
+
 # =========================================================================
 # Config persistence for permanent allowlist
 # =========================================================================