Improve skills architecture based on Sentry warden and junior-prod patterns

[MathurAditya724]

Overhaul the skills system based on patterns observed in getsentry/warden (LLM code review agent) and getsentry/junior-prod (Slack-native AI bot).

Changes

• SPEC.md for every skill — maintenance contracts defining intent, scope, runtime contracts, and evaluation criteria (pattern from both Sentry repos)
• References directories — focused sub-documents for resolve-issue, review, and fix-ci enabling conditional context loading instead of monolithic prompts
• Confidence calibration — review skill now requires HIGH/MEDIUM/LOW classification; LOW findings are dropped
• Not-a-finding guide — explicit list of patterns that look wrong but are typically correct, reducing false positives
• Investigation-first mandate — resolve-issue now requires articulating "this breaks because X, in Y path, after Z condition" before editing
• Verification harness table — match change shape to verification method (unit test, integration test, build, lint, etc.)
• Expanded deslop patterns — additional AI noise patterns (redundant type annotations, unnecessary else after return, debug logging, verbose names)
• Conventional commit titles — pr skill now checks repo history and uses conventional commit format when appropriate
• Self-update skill — new skill for automated dependency maintenance
• Softer imperative language — reduced anchoring from excessive MUST/NEVER without removing safety constraints

What was NOT changed

• webhooks.json — no changes to event routing, email handling, or trigger configuration
• Email triage logic in github-agent.md — untouched to avoid notification regressions
• Core triage logic — no changes to skip conditions or event handling
• No TypeScript/application code changes — this PR is skills/prompts only

Testing

Skills are markdown-based prompts; no runtime tests apply. Verified via manual review of all diffs.

Closes: N/A (improvement initiative)

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