OLS-3024 Add compliance audit logging spec

[thoraxe]

Summary

• Adds .ai/spec/what/audit-logging.md — service-side audit logging implementation spec
• Covers: request lifecycle audit events, conversation_id/user_id propagation to all log lines, OTEL span hierarchy, audit config consumption from olsconfig.yaml
• Parent spec: ols/.ai/spec/what/audit-logging.md

Test plan

• Team review for completeness against parent spec
• Verify conversation_id and user_id availability at all instrumentation points

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📥 Commits

Reviewing files that changed from the base of the PR and between a8aa7a8 and 9cb8eeb.

📒 Files selected for processing (1)

• .ai/spec/what/audit-logging.md

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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