Fix PHP treesitter query error "Invalid node type php_end_tag" on every cursor move

[Copilot]

Nvim + treesitter users editing PHP files saw a repeated error on every cursor move because the matchup query referenced a tree-sitter node type not present in their installed grammar.

Root cause

after/queries/php/matchup.scm matched PHP's closing tag via a named (php_end_tag) node. That node only exists in the very latest upstream tree-sitter-php grammar; the revision currently locked by nvim-treesitter (what most users actually have installed) still represents ?> as an anonymous token. Query compilation fails hard on unknown node types, so every match computation errored out.

Changes

• Query fix: use "?>" @close.php instead of (php_end_tag) @close.php, matching the anonymous token used by the currently-shipped grammar (and matching nvim-treesitter's own highlights.scm).
• Defensive guard: wrap treesitter query compilation in pcall in internal.lua, caching failures per-language so a mismatch logs a single warning and disables treesitter matching for that language instead of erroring on every cursor move.
• Regression test: new test/new/test-treesitter/example.php plus additions to test.vim covering PHP tag matching and if/else matching.
• CI: build a tree-sitter-php parser pinned to the same revision nvim-treesitter locks, so the new PHP test runs in CI.

; PHP tags
 (php_tag) @open.php
-(php_end_tag) @close.php
+"?>" @close.php
 (program) @scope.php

• Fixes Nvim + treesitter gives error "Invalid node type php_end_tag" on every cursor move #448

[andymass]

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