Add --plugin grouping to wp profile hook resource output

[Copilot]

wp profile could not report resource usage at plugin granularity when profiling hooks. This change adds a plugin-level view so callback metrics can be aggregated per plugin via a first-class CLI flag.

• Hook command surface

  • Added --plugin to wp profile hook options.
  • Updated command synopsis/docs (README.md, feature usage output) to include the new flag.

• Plugin-level aggregation

  • Added grouping path in Command::hook() to aggregate callback metrics by plugin when --plugin is set.
  • Aggregates time, query/cache/request counters and durations, and computes aggregate cache_ratio.
  • Supports both standard plugins and mu-plugins by deriving plugin slug from callback location.

• Behavior constraints

  • --plugin is only valid when profiling callbacks (wp profile hook <hook> or --all).
  • Returns a clear error if used on hook summary mode.

• Acceptance coverage

  • Added Behat scenario validating plugin-grouped output for a test plugin on init.

wp profile hook init --plugin --fields=plugin,cache_hits,cache_misses

Example output shape:

+---------------+------------+--------------+
| plugin        | cache_hits | cache_misses |
+---------------+------------+--------------+
| resource-test | 0          | 1            |
+---------------+------------+--------------+
| total (1)     | 0          | 1            |
+---------------+------------+--------------+

[codecov]

Codecov Report

❌ Patch coverage is 68.83117% with 24 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/Command.php	68.83%	24 Missing ⚠️

📢 Thoughts on this report? Let us know!

[Copilot]

Pull request overview

Adds a new --plugin flag to wp profile hook so hook callback metrics can be aggregated and displayed at plugin granularity (including mu-plugins), with docs and Behat coverage updated accordingly.

Changes:

• Added --plugin flag to wp profile hook and implemented plugin-level aggregation of callback metrics.
• Updated CLI documentation/usage strings to include the new flag.
• Added a Behat scenario for plugin-grouped output and a dev dependency to support plugin activation in tests.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/Command.php	Adds --plugin option handling, plugin grouping aggregation, and plugin slug extraction from callback location.
README.md	Documents the new --plugin flag in synopsis/options.
features/profile.feature	Updates usage output to include --plugin.
features/profile-hook.feature	Adds acceptance coverage for --plugin grouped output.
composer.json	Adds wp-cli/extension-command to dev dependencies (used by the new Behat scenario).

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.