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.sh

@@ -1326,8 +1326,7 @@ PYEOF
 # if none). find_workspace_uuid is already a workspace-scoped, 3-tier, race-free
 # resolver (per-row own id -> workspace-scoped disk scan -> cwd-matched cache),
 # so recording its result into the row before kill guarantees tier-1 on the next
-# resume. Pass session_name to scope resolution to that row (required for
-# isolated sessions — see isolation block / T5). Always exits 0.
+# resume. Pass session_name to prefer that specific row's recorded id. Always exits 0.
 # ---------------------------------------------------------------------------
 capture_conversation_id() {
   local agent="$1" workdir="$2" session_name="${3:-}"