feat(memory): implement conversation_analyze job handler

[siddseethepalli]

Summary

• Implement conversationAnalyzeJob handler that retrieves deps via the singleton and calls analyzeConversation(id, deps, { trigger: "auto" }).
• Wire dispatch in jobs-worker.ts next to graph_extract.
• Throws when deps aren't yet initialized so the worker reschedules.
• Logs (does not throw) when the service rejects (e.g. recursion guard).

Part of plan: auto-analyze-loop.md (PR 13 of 15)

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[devin-ai-integration]

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[chatgpt-codex-connector]

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[siddseethepalli]

Already addressed in #25676 (different approach): the handler now returns early when getAnalysisDeps is null, letting upstream triggers re-enqueue naturally instead of deferring. See the in-file comment in conversation-analyze-job.ts for the rationale (defer counters would still fail permanently in worst case; early return avoids retry storms during slow startup).