chore: remove unused npm and clean up ctags artifacts in Docker image

[brendan-kellam]

Summary

• Remove bundled npm, npx, and related caches from the runner stage. We use Yarn exclusively, so npm is dead weight. Its transitive dependencies (minimatch, tar, picomatch) were being flagged by Trivy as vulnerable.
• Clean up ctags source tree left in /tmp after the install script (~109MB of build artifacts).

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Optimized production Docker image by removing unnecessary build tooling and temporary artifacts, reducing deployment size and improving deployment efficiency.

[github-actions]

@brendan-kellam your pull request is missing a changelog!

[coderabbitai]

Walkthrough

The Dockerfile was modified to reduce final image size by removing bundled Node.js tooling (npm, npx, npm/node-gyp directories) from the runner stage and adding cleanup of temporary build artifacts during the ctags installation step.

Changes

Cohort / File(s)	Summary
Docker Image Optimization Dockerfile	Added removal of npm and node-gyp artifacts from final runner stage; extended ctags installation step with cleanup of /tmp/* directory to reduce image footprint.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main changes: removing unused npm tooling and cleaning up ctags artifacts from the Docker image.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch brendan/docker-image-cleanup

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