fix(plugin-dev): support plugin wrapper format in validate-hook-schema.sh

[kp222x]

Summary

• Fixes the validate-hook-schema.sh script to correctly handle both hook configuration formats
• Previously, the script would fail with jq errors when validating plugin hooks/hooks.json files using the wrapper format that the skill itself recommends

Changes

• Detect wrapper format by checking for .hooks key
• Add helper function build_path() for constructing format-aware jq queries
• Validate optional description field in wrapper format
• Update all jq queries to use format-aware paths

Formats Now Supported

Plugin wrapper format (now works):

{
  "description": "Brief explanation",
  "hooks": {
    "PreToolUse": [...]
  }
}

Direct/settings format (still works):

{
  "PreToolUse": [...]
}

Test Plan

• Tested plugin wrapper format - passes validation
• Tested direct/settings format - passes validation (no regression)
• Tested error detection - still catches invalid hooks

Test Evidence

Wrapper format (the bug case):

🔍 Validating hooks configuration: /tmp/test-wrapper-hooks.json

Checking JSON syntax...
✅ Valid JSON

Detecting hook format...
✅ Detected plugin wrapper format

Checking root structure...
✅ Root structure valid

Validating individual hooks...

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
✅ All checks passed!

Direct format (regression check):

🔍 Validating hooks configuration: /tmp/test-direct-hooks.json

Checking JSON syntax...
✅ Valid JSON

Detecting hook format...
✅ Detected direct/settings format

Checking root structure...
✅ Root structure valid

Validating individual hooks...

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
✅ All checks passed!

Fixes #13292

🤖 Generated with Claude Code