fix(agents): harden shell adapter bridge and address double-check review feedback

- create_session.sh: add explicit case fallback for delegate_agent (R1)
- lib_py.agents: add spawn-spec, resume-spec, exit-key argv CLI subcommands (R2)
- resume_session.sh, stop_session.sh: replace python string interpolation with safe argv subcommands (R2)
- stop_session.sh: dynamically iterate adapter.identity_cache_fields (R3)
- verify_session.py, workspace_uuid.py: remove dead imports (R9/N4)
- tests/test_a4_adapter_contract.py: add CLI bridge subcommand, clean-env PYTHONPATH safety, and fallback contract tests (R12/N1)
- SKILL.md, docs, logs: synchronize IMPROVEMENTS.md, LOG.md, and resolve_session_id wording (R8/R10/R11)
- promote verified peer review reports for cline (e7b9812b) and claude (31730364)

.agents/skills/lib_py/agents/__main__.py

@@ -46,6 +46,40 @@ def main():
             print(f"ERROR: {ex}", file=sys.stderr)
             sys.exit(5)
 
+    elif cmd == 'spawn-spec':
+        agent_name = sys.argv[2] if len(sys.argv) > 2 else ''
+        binary = sys.argv[3] if len(sys.argv) > 3 else agent_name
+        uuid = sys.argv[4] if len(sys.argv) > 4 else ''
+        use_wrapper = (sys.argv[5].lower() in ('1', 'true', 'yes')) if len(sys.argv) > 5 else False
+        adapter = get_adapter(agent_name)
+        if not adapter:
+            sys.exit(1)
+        print(adapter.spawn_spec(binary, uuid, use_wrapper=use_wrapper))
+        sys.exit(0)
+
+    elif cmd == 'resume-spec':
+        agent_name = sys.argv[2] if len(sys.argv) > 2 else ''
+        binary = sys.argv[3] if len(sys.argv) > 3 else agent_name
+        uuid = sys.argv[4] if len(sys.argv) > 4 else ''
+        workspace = sys.argv[5] if len(sys.argv) > 5 else ''
+        adapter = get_adapter(agent_name)
+        if not adapter:
+            sys.exit(1)
+        from lib_py.agents.base import DiscoveryContext
+        ctx = DiscoveryContext(workspace, agent_name) if workspace else None
+        mat = adapter.verify_artifact(uuid, ctx) if (ctx and uuid) else False
+        print(adapter.resume_spec(binary, uuid, materialized=mat))
+        sys.exit(0)
+
+    elif cmd == 'exit-key':
+        agent_name = sys.argv[2] if len(sys.argv) > 2 else ''
+        adapter = get_adapter(agent_name)
+        if adapter:
+            print(adapter.exit_key)
+            sys.exit(0)
+        print('/exit')
+        sys.exit(0)
+
     else:
         print(f"ERROR: Unknown CLI command {cmd!r}", file=sys.stderr)
         sys.exit(1)