feat(stovepipe): add request logs for outcomes and lifecycle events

[mnoah1]

Summary

This PR builds on #665, which records Process-owned request states.

Intent:

• Retain terminal request outcomes and the durable build/fact milestones that explain them.
• Let queue redelivery repair any missing occurrence before downstream work continues.

Changes:

• Persist succeeded, failed, and cancelled request states with their build outcome reasons.
• Record build_triggered, build_finished, and validation_fact_recorded events with stable identities and bounded metadata.
• Keep each source write ahead of event materialization and materialization ahead of downstream publication or derived work.
• Wire the shared materializer into Build, BuildSignal, and Record.

Test Plan

• Run the focused Build, BuildSignal, Record, request-log materializer, and server wiring Bazel tests.

Revert Plan

• Revert this change to stop recording terminal outcomes and lifecycle events.

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Issues

Stack

1. feat(stovepipe): add request logs for process owned states #665
2. @ feat(stovepipe): add request logs for outcomes and lifecycle events #666
3. feat(stovepipe): add request logs for dlq outcomes #667