CI run on PR #2355 surfaced `pq: invalid input syntax for type uuid:
ws-poll-e2e-1777529293-3363` — workspaces.id is UUID-typed and the
hand-rolled "ws-<tag>" shape fails the cast. Phase 1 returned
generic 'registration failed' which cascaded into Phase 3 'lookup
failed' (resolveAgentURL on a non-existent row) and Phase 4 'missing
workspace auth token' (no token extracted because Phase 1 didn't run
the bootstrap path).
Generate v4 UUIDs via uuidgen (with a python3 fallback), one each
for the poll workspace, the caller workspace, and the Phase 2
invalid-mode probe.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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