Add bug_auth_token_expiry_race benchmark scenario fixtures

[BrhKmr23]

Summary

Adds the complete fixture set for the bug_auth_token_expiry_race benchmark scenario: a JWT token expiry race condition in auth-service that causes intermittent 401s under concurrent load.

Files added

Acme universe (fixtures/raw_events/universe/acme/)

• 4 service manifests (repo_docs / service_manifest): auth-service, api-gateway, checkout-api, user-profile-api
• 1 CODEOWNERS file (repo_docs / codeowners): maps services to owners including Maya Chen (auth lead) and Jordan Park (SRE on-call)

Signal fixtures (fixtures/raw_events/)

File	Connector	Story beat
linear/ops_355_jwt_expiry_symptom.json	linear / issue / create	Symptom report — intermittent 401s, no root cause
slack/thread_jwt_race_diagnosis.json	slack / message / thread	Real-time diagnosis narrowing to refresh worker race
linear/ops_431_jwt_race_root_cause.json	linear / issue / create	Root cause identified, links OPS-355
notion/postmortem_jwt_race.json	notion / page / created	Postmortem with timeline, fix, follow-ups

Scenario YAML (scenarios/bug_auth_token_expiry_race.yaml)

• Ingest timeline: OPS-355 (-14d) → Slack (-13d) → OPS-431 (-10d) → postmortem (-7d)
• Query scoped to auth-service
• Ground truth must_cite source_ids aligned with fixture envelopes

Validation

All 9 fixture envelopes pass validate_all_fixtures(). Acme universe discovery yields 5 seed files at -365d.

Other

• Added .gitignore exception for benchmarks/fixtures/raw_events/**/*.json so synthetic fixtures can be committed (previously blocked by global *.json rule).

  

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