test(treesitter): honor both supported parser fixtures

[metaphorics]

Parser fixture contract

This layer follows PR #34. It changes a test fixture, not the tree-sitter
implementation or its expected highlighting behavior.

The test helper accepts either a Lua or C parser. The highlight regression
nevertheless always parsed Lua source and queried Lua's number and chunk
nodes. With a real C parser, it failed before reaching any highlight assertion:
Invalid node type "number".

The fixture now selects valid source and node names for the selected grammar.
Both sources place value at columns 6 through 11 and span two rows. All
assertions remain: capture count, hidden-group filtering, buffer and namespace
IDs, exact coordinates, default priority, explicit priority, and root range.
An additional assertion rejects a syntax-error tree.

Validation used tree-sitter-c v0.24.2, built from the archive whose SHA-256 is
2eeb4db31f8fa0865e45488503d13403923bcb485a1bdb637abff8c42dd97364.
The complete workspace command was:

unset CARGO_BUILD_BUILD_DIR RUSTC_WRAPPER
export CARGO_TARGET_DIR="$PWD/target" CARGO_BUILD_JOBS=8
export OXVIM_TREE_SITTER_PARSER="$PWD/target/test-fixtures/c.so"
export OXVIM_TREE_SITTER_LANGUAGE=c
cargo nextest run --locked --release --workspace --no-fail-fast

Result: 3,470 tests ran; 3,469 passed and one failed. One further test was
skipped by the existing configuration. The failure is
differential::perf_contract::steady_state_workloads_are_state_neutral, whose
required .references/neovim/build/bin/nvim binary is absent. The test was
not bypassed or changed. This is not a passing full-workspace gate or a
completed performance comparison.

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📥 Commits

Reviewing files that changed from the base of the PR and between c1152ae and 07cd127.

📒 Files selected for processing (2)

• .outline/sdd/reports/2026-09-20-parser-fixture-contract.md
• crates/ox-lua/tests/treesitter.rs

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-20T21:05:15.886970Z	07cd127	Manual request

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[amazon-q-developer]

This PR successfully updates the tree-sitter test fixture to support both Lua and C parsers. The implementation correctly selects language-specific source code and node types, and adds appropriate error checking with assert(not root:has_error()). All original assertions are preserved while fixing the C parser compatibility issue. The changes are well-structured and maintain test coverage.

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[metaphorics]

@codex review

[metaphorics]

/q review

[amazon-q-developer]

The changes correctly address the parser fixture contract issue by adding language-specific handling for both Lua and C parsers. The test now properly selects appropriate source code and node types based on the parser language, maintaining all original assertions while ensuring compatibility with both grammars.

Key improvements:

• Conditional source and node type selection based on parser language
• Added syntax error assertion to verify valid parse trees
• Updated comment accuracy for multi-grammar support

The implementation is sound with no blocking defects identified.

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[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Delightful!

Reviewed commit: 07cd127ff3

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