🧹 Extract inline awk script to improve idstack-gen-skills readability

[savvides]

🎯 What: Extracted a large inline awk script from bin/idstack-gen-skills into its own file bin/render-skill.awk.
💡 Why: It simplifies and improves the readability of bin/idstack-gen-skills, addressing a code health issue where an overly long function render_template was heavily bloated by a complex inline awk script string.
✅ Verification: Verified the logic change by running the complete set of tests (./test/smoke-test.sh and ./test/integration-test.sh). The CLI dry-run also verifies nothing changes during rendering.
✨ Result: The logic is successfully decoupled into a standalone file without breaking behavior or changing standard usage patterns.

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PR created automatically by Jules for task 4205765716975549657 started by @savvides

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[gemini-code-assist]

Code Review

This pull request refactors the bin/idstack-gen-skills script by extracting its inline awk template rendering logic into a dedicated file, bin/render-skill.awk. The review feedback recommends removing an unused variable (after_frontmatter) from the BEGIN block and adding robust error handling for getline operations to prevent silent failures when reading external files.

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[gemini-code-assist]

The variable after_frontmatter is initialized in the BEGIN block but is never used anywhere else in the script. Removing this unused variable improves code cleanliness and maintainability.

BEGIN {
  frontmatter_count = 0
  in_allowed_tools = 0
}

[gemini-code-assist]

If getline encounters an error (e.g., if the file is unreadable or permission is denied), it returns -1. Currently, this silent failure is unhandled, which would result in the placeholder being silently removed without inserting the preamble or schema content. Checking the return value of getline and exiting on error prevents silent failures and ensures generation robustness.

/\{\{PREAMBLE\}\}/ {
  while ((status = (getline line < preamble_file)) > 0) {
    print line
  }
  if (status < 0) {
    print "ERROR: failed to read " preamble_file > "/dev/stderr"
    exit 1
  }
  close(preamble_file)
  next
}
/\{\{MANIFEST_SCHEMA\}\}/ {
  while ((status = (getline line < schema_file)) > 0) {
    print line
  }
  if (status < 0) {
    print "ERROR: failed to read " schema_file > "/dev/stderr"
    exit 1
  }
  close(schema_file)
  next
}