feat(supervisor): add prometheus metric for outbound http requests

[nicktrn]

Adds Prometheus metrics so the supervisor's outbound HTTP calls are observable - including client-side failures that previously only surfaced as a log line.

• supervisor_outbound_request_total{name, method, status, outcome} - counts every outbound request. outcome separates a transport failure (network_error), an HTTP error response (http_error), a response that failed schema validation (invalid_response), and success (ok).
• supervisor_outbound_request_duration_seconds{name, outcome} - latency histogram. Leaner labels than the counter (no status) to avoid bucket×label cardinality; buckets match the existing dequeue-latency histogram since these calls share the same retrying HTTP client and long-poll envelope.

Coverage:

• The warm-start request (a one-off fetch) - instrumented inline; the response status code is now also included in the failure log (it was previously dropped).
• All worker API client calls (SupervisorHttpClient: dequeue, run attempt start/complete, heartbeats, snapshots, continue, suspend, debug-log, connect) - routed through a single instrumented request() helper that reports via an optional onHttpRequestComplete callback on the client, which the supervisor wires into the counter + histogram.

Low cardinality by design: name is a static per-endpoint label (e.g. dequeue, start_run_attempt), never the interpolated URL - so no run/snapshot IDs land in labels, mirroring the templated route labels on the inbound HTTP server.

Registered on the existing metrics registry, exposed on /metrics with no new wiring. Internal-only change (no package release needed), so the changelog note is a single .server-changes entry.

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Latest commit: 1beda66

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[coderabbitai]

Walkthrough

The supervisor client now exposes HTTP request completion metrics and routes its HTTP methods through a shared reporting helper. The supervisor application registers labeled Prometheus counter and duration metrics, wires request completion callbacks to update them, and records warm-start HTTP, response-validation, success, and network outcomes. A server-change entry documents the added outbound request observability.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the change, but it omits required template sections like Closes #issue, checklist items, testing steps, and screenshots.	Add the missing template sections: Closes #issue, completed checklist, testing steps, changelog, and screenshots or an explicit note that none are needed.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: adding Prometheus metrics for supervisor outbound HTTP requests.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/supervisor-outbound-request-metrics

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