feat(php): add PHPUnit filter with compact output (65%+ token savings)

- New `rtk phpunit` command: state-machine filter that captures test
  names, assertion messages, and file locations from PHPUnit output,
  stripping version banner, progress dots, timing, and memory noise
- Supports all invocation variants: `phpunit`, `vendor/bin/phpunit`,
  `bin/phpunit` (Symfony), `php vendor/bin/phpunit`, `php bin/phpunit`
- Binary detection priority: global phpunit → bin/phpunit → vendor/bin/phpunit
- Registers in discover/rules.rs for `rtk discover` and hook rewriting
- 17 tests: 7 filter tests (including token savings ≥60%), 10 registry
  tests for classify/rewrite across all variants; real fixture in
  tests/fixtures/phpunit_raw.txt
- "OK (X tests, Y assertions)" → already worked, now also shows
  counts for the generic fallback path
- "OK, but incomplete, skipped, or risky tests!" → new handler
  shows skipped count (e.g. "PHPUnit: 9 tests, 15 assertions, 2 skipped")
- Generic fallback now calls parse_counts to show test/assertion
  counts instead of bare "PHPUnit: OK"
- parse_counts returns 4-tuple (tests, assertions, failures, skipped)
  to support Skipped: field with trailing-period stripping
- 3 new tests covering each success variant
- catch segfault + Fatal error

Author: Beninho

README.md

@@ -176,6 +176,7 @@ rtk go test                     # Go tests (NDJSON, -90%)
 rtk cargo test                  # Cargo tests (-90%)
 rtk rake test                   # Ruby minitest (-90%)
 rtk rspec                       # RSpec tests (JSON, -60%+)
+rtk phpunit                     # PHPUnit tests (failures only, -65%+)
 ```
 
 ### Build & Lint
@@ -418,6 +419,7 @@ Blocked on upstream BeforeToolCallback support ([mistral-vibe#531](https://githu
 | `rake test` / `rails test` | `rtk rake test` |
 | `rspec` / `bundle exec rspec` | `rtk rspec` |
 | `rubocop` / `bundle exec rubocop` | `rtk rubocop` |
+| `phpunit` / `vendor/bin/phpunit` / `bin/phpunit` | `rtk phpunit` |
 | `bundle install/update` | `rtk bundle ...` |
 | `docker ps/images/logs` | `rtk docker ...` |
 | `kubectl get/logs` | `rtk kubectl ...` |

scripts/test-all.sh

@@ -564,6 +564,16 @@ section "Hook check (#344)"
 
 assert_contains "rtk init --show hook version" "version" rtk init --show
 
+# ── 42. PHP (conditional) ───────────────────────────
+
+section "PHP (conditional)"
+
+if command -v phpunit &>/dev/null || [ -f vendor/bin/phpunit ] || [ -f bin/phpunit ]; then
+    assert_help    "rtk phpunit"                    rtk phpunit --help
+else
+    skip_test "rtk phpunit" "phpunit not installed"
+fi
+
 # ══════════════════════════════════════════════════════
 # Report
 # ══════════════════════════════════════════════════════

src/cmds/mod.rs

@@ -5,6 +5,7 @@ pub mod dotnet;
 pub mod git;
 pub mod go;
 pub mod js;
+pub mod php;
 pub mod python;
 pub mod ruby;
 pub mod rust;

src/cmds/php/mod.rs

@@ -0,0 +1,3 @@
+//! PHP ecosystem filters.
+
+pub mod phpunit_cmd;