chore: clean .gitignore cache

docs/plans/pr-434-docker-analysis.md

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-# PR #434 Docker Workflow Analysis & Remediation Plan
-
-**Status**: Analysis Complete - NO ACTION REQUIRED
-**Created**: 2025-12-21
-**Last Updated**: 2025-12-21
-**Objective**: Investigate and resolve reported "failing" Docker-related tests in PR #434
-
----
-
-## Executive Summary
-
-**PR Status:** ✅ ALL CHECKS PASSING - No remediation needed
-
-PR #434: `feat: add API-Friendly security header preset for mobile apps`
-
-- **Branch:** `feature/beta-release`
-- **Latest Commit:** `99f01608d986f93286ab0ff9f06491c4b599421c`
-- **Overall Status:** ✅ 23 successful checks, 3 skipped, 0 failing, 0 cancelled
-
-### The "Failing" Tests Were Actually NOT Failures
-
-The 3 "CANCELLED" statuses reported were caused by GitHub Actions' concurrency management (`cancel-in-progress: true`), which automatically cancels older/duplicate runs when new commits are pushed.
-
-**Key Finding:** A successful Docker build run exists for the exact same commit SHA (Run ID: 20406485263), proving all tests passed.
-
----
-
-## Conclusion
-
-**No remediation required.** The PR is healthy with all required checks passing. The "failing" Docker tests are actually cancelled runs from GitHub Actions' concurrency management, which is working as designed to save resources.
-
-### Key Takeaways
-
-1. ✅ All 23 required checks passing
-2. ✅ Docker build completed successfully
-3. ✅ Zero security vulnerabilities found
-4. ℹ️ CANCELLED = superseded runs (expected)
-5. ℹ️ NEUTRAL Trivy = skipped for PRs (expected)
-
-### Next Steps
-
-**Immediate:** None - PR is ready for review and merge
-
----
-
-**Analysis Date:** 2025-12-21
-**Analyzed By:** GitHub Copilot
-**PR Status:** ✅ Ready to merge (pending code review)