Backfill Lessons Learned sections in 10 originating plan documents

[clcollins]

Summary

• Analyzed all 112 plan documents to identify fix relationships where a later plan corrected a flaw from an earlier one
• Found 15 genuine fix relationships and added Lessons Learned sections to the 10 originating plan documents that were missing them
• Each lesson follows the Agentic SDLC convention: category (GENUINE ERROR / PROCESS GAP), what happened, why it wasn't caught, what should change
• Docs-only change — no code modifications

Highlights

Notable patterns discovered across the fix chain analysis:

1. Narrow fixes missing other instances (009→013→059): fixing one handler but not auditing all handlers for the same bug class
2. Incomplete deprecation (083→084): removing runtime behavior but leaving stale references in templates/help/README
3. Hardcoded assumptions (055-claude→061): hardcoding external binary names that break in different environments
4. Silent failures (003→058): CI integrations that fail without error, just missing data
5. Dev/prod divergence (055-dev→066): dev fixtures that don't mirror production API structure
6. 055-claude-cli-integration spawned 3 fix plans — the most prolific originator, suggesting the original design needed more upfront consideration of input isolation and dispatch extensibility

Test plan

• Docs-only change, no code affected
• grep -c "## Lessons Learned" docs/plans/*.md confirms 15 files now have the section
• Each new section cross-references the fix plan doc by filename
• CI passes (no code changes, only markdown)

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.60%. Comparing base (366d7ec) to head (5adcb05).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #326      +/-   ##
==========================================
- Coverage   68.30%   67.60%   -0.71%     
==========================================
  Files          46       49       +3     
  Lines        7323     7568     +245     
==========================================
+ Hits         5002     5116     +114     
- Misses       1988     2110     +122     
- Partials      333      342       +9     

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