chore(webhook): enable uvicorn access_log for ingress visibility

[ClaydeCode]

Summary

• Flip access_log=False → True on the uvicorn Config in orchestrator.py:375.
• Pebble webhooks fail silently when the request never enqueues (bad token → 401, wrong path → 404, schema mismatch → 422). With access logging off, none of those leave a trace.
• Today an investigation hit exactly this blind spot: two hours of "webhooks sent, no effect" with zero clayde.pebble.enqueue spans and no log lines either. Cause was unknowable without a request log.

Test plan

• Rebuild + redeploy container, post a webhook with no auth → expect a 401 line in docker logs clayde-clayde-1.
• Post a valid webhook → expect a 200 line plus existing [id] enqueued log.
• Confirm no perf regression (access_log writes are cheap and webhook traffic is low).

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