1. BUG 8 (second door): merge webhook no longer fake-completes a task at the
deploy stage; done is gated by the deployer verdict (check_deploy_status).
Other stages keep merge->done.
2. Token accounting: parse+persist cache_creation_input_tokens (new
idempotent agent_runs column). usage_comment / task_summary now show the
FULL input (input + cache_read + cache_creation) with a cached breakdown.
cost_usd untouched.
3. deploy->done success now forces the Plane issue to terminal Done state.
4. All agents (architect/developer/reviewer/tester/deployer) attach artifact
links to their finish comment via gitea_public_url.
Tests added for each fix; pytest 244 passed / 9 failed (off-limits HMAC group).
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