chore(stop,resume): drop what Issue #63 left unused (Issue #63)

- workspace_uuid.py: the unused sys import.
- stop_session.sh: the orphan CAPTURE_ID and the blank padding that kept
  later line numbers; the inventory pins follow the move instead.
- lib.sh: capture_conversation_id, which nothing calls any more.
- resume SKILL.md: the flow names the session-id decision (session_ids.py),
  not resolve_session_id.sh.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.agents/skills/lib.sh

@@ -2023,22 +2023,6 @@ find_workspace_uuid_main()
 PYEOF
 }
 
-# ---------------------------------------------------------------------------
-# capture_conversation_id <agent> <workdir> [session_name]
-#
-# Thin wrapper over find_workspace_uuid: resolves THIS workspace's conversation
-# id (claude jsonl sessionId / agy db uuid) and prints it on stdout (empty line
-# if none). find_workspace_uuid is already a workspace-scoped, 2-tier, race-free
-# resolver (per-row own id -> workspace-scoped disk scan),
-# so recording its result into the row before kill guarantees tier-1 on the next
-# resume. Pass session_name to prefer that specific row's recorded id. Always exits 0.
-# Note (Issue #63): stop_session.sh no longer calls this directly (it uses mam_session_ids).
-# ---------------------------------------------------------------------------
-capture_conversation_id() {
-  local agent="$1" workdir="$2" session_name="${3:-}"
-  find_workspace_uuid "$workdir" "$agent" "$session_name"
-}
-
 # ---------------------------------------------------------------------------
 # mam_session_ids <stop|resume> [args...]
 # Issue #63: stop/purge/resume conversation-id decision (lib_py.agents.session_ids).