chore: add macOS universal-ctags v6.1.0 install script

[brendan-kellam]

Summary

• Adds install-ctags-macos.sh to build and install universal-ctags v6.1.0 from source on macOS
• Updates CONTRIBUTING.md to replace the brew install universal-ctags instruction with the new script for macOS, and adds build-from-source instructions for Linux and other platforms

Why v6.1.0?

universal-ctags 6.2.1 (the current Homebrew version) has a known incompatibility with zoekt: it emits JSON _type: "error" warning messages about the Cargo subparser at startup when Rust is in the language list. The go-ctags library treats any _type: error response as fatal, causing indexing to silently fall back to no symbol extraction. v6.1.0 is the version pinned in vendor/zoekt/install-ctags-alpine.sh and does not have this issue.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation

  • Updated contributor setup instructions with new installation requirements and platform-specific guidance.

• Chores

  • Added automated installation script for developer environment setup on macOS.

[github-actions]

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

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: fb9b1412-58b8-40a4-8b51-dfcc69ebd60e

📥 Commits

Reviewing files that changed from the base of the PR and between 70484e8 and 0183c73.

📒 Files selected for processing (2)

• CONTRIBUTING.md
• install-ctags-macos.sh

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Walkthrough

Updates contributor setup documentation to use pinned universal-ctags v6.1.0 instead of generic ctags, adds platform-specific installation instructions in CONTRIBUTING.md, and introduces a macOS installation shell script. Requires setting CTAGS_COMMAND environment variable after installation.

Changes

Cohort / File(s)	Summary
Documentation Updates CONTRIBUTING.md	Updated ctags installation guidance with pinned v6.1.0 requirement, platform-specific steps (macOS script and Linux source-build workflow), and environment variable configuration requirement.
Installation Scripts install-ctags-macos.sh	New shell script automating universal-ctags v6.1.0 installation on macOS via Homebrew dependencies, source download, build configuration with JSON support, and binary installation to /usr/local/bin.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

✨ 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 bkellam/install-ctags-macos

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