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/multi-agent-mux-resume/scripts/resolve_session_id.sh

@@ -15,8 +15,7 @@ usage() {
   cat <<EOF
 Usage: $0 --workspace <path> --agent <claude|agy|hermes|cline> [--session <name>]
 Outputs the resolved UUID on stdout (empty if not found).
---session scopes resolution to that registry row — required for sessions
-created with --isolate (their conversation lives only in the row's isolation root).
+--session prefers that registry row's recorded id; falls back to workspace-wide discovery if it does not verify.
 EOF
 }