fix: add retry logic, size guards, and quality gates to facts pipeline

[madjin]

Summary

• extract-facts.py: Add retry loop (2 attempts, 5s delay), completion token sanity check (<200 tokens = truncated), detailed failure logging with response preview, and debug sidecar file on final failure
• aggregate-sources.py: Cap user_summaries at 200KB to prevent token explosion (2026-01-15 was 984KB/392K tokens), warn when estimated tokens >100K, fix missing import sys
• extract_daily_facts.yml: Quality-gated daily.json permalink (only overwrite on success), workflow-level retry with 30s delay (4 total attempts combined with script retry), Discord alert on error stubs
• Backfill: All 9 error stubs regenerated successfully — retry logic recovered 2 dates on second attempt (2026-01-26: JSON parse error, 2025-07-22: invalid control character)

Test plan

• Verify all 9 previously-failed dates now have status: success (392 facts files, 0 errors)
• Verify 2026-01-15 re-aggregation reduced tokens from 282K to 90K
• Validate Python syntax for both scripts
• Validate workflow YAML syntax
• Next daily run exercises the full workflow (retry + quality gate + alert)

🤖 Generated with Claude Code

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/resilient-facts-pipeline

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