fix: resolve YAML syntax error in update-docs workflow and add actionlint

[jeremyeder]

Summary

• Fixed YAML syntax error in .github/workflows/update-docs.yml on line 43
• Added actionlint to pre-commit hooks for local workflow validation
• Fixed shellcheck warnings in workflow shell script

Changes

Workflow Syntax Fix

Replaced template literal syntax with array concatenation to avoid YAML parsing issues:

• Before: Used ${variable} inside multi-line template literal
• After: Build body using array and .join('\n') method

Shell Script Improvements

Added proper quoting around $GITHUB_OUTPUT variable to satisfy shellcheck.

Pre-commit Enhancement

Added actionlint hook to .pre-commit-config.yaml to catch workflow issues locally before push.

Testing

pre-commit run actionlint --files .github/workflows/update-docs.yml
# ✓ Passed

Why This Matters

GitHub Actions YAML parser can be sensitive to nested template literals with special characters. The error was triggered by the ${revisionReason} interpolation inside a backtick-quoted string within the YAML script: | block.

The actionlint addition prevents future workflow syntax issues from reaching CI.

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