✨feat(lang): support attribute access after selector call (.h(1).level)

[harehare]

• Add AST/CST parser logic to allow attribute selectors after selector calls (e.g., .h(1).level)
• Add integration and parser tests for selector call attribute access
• Enables queries like .h(2).depth and .code("rust").lang

[Copilot]

Pull request overview

Adds language support for attribute access immediately after selector calls (e.g., .h(1).level), extending existing attribute-suffix behavior that previously worked for plain selectors (e.g., .code.lang).

Changes:

• Extend CST parsing to accept an attribute selector immediately following a selector call.
• Extend AST parsing to lower .selectorCall(...).attr into an attr(selectorCall(...), "attr") builtin call.
• Add parser unit tests and an integration test covering the new selector-call attribute access syntax.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
crates/mq-lang/tests/integration_tests.rs	Adds an end-to-end evaluation case for .h(2).depth after a selector call.
crates/mq-lang/src/cst/parser.rs	Updates CST selector parsing to allow an attribute selector token immediately after selector-call args.
crates/mq-lang/src/ast/parser.rs	Refactors attribute lowering and adds handling/tests for attribute suffixes on Expr::SelectorCall.

[codspeed-hq]

Merging this PR will not alter performance

✅ 29 untouched benchmarks

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_{Comparing feat/support-attribute-access-after-selector-call (ade99f2) with main (d4f15fd)}

[Copilot]

Pull request overview

This PR extends mq-lang’s parsing pipeline to support attribute access immediately after selector calls (e.g. .h(1).level), enabling more ergonomic selector-call chaining that desugars into the existing attr(...) / set_attr(...) machinery.

Changes:

• Extend CST parsing to recognize an attribute-selector token following a SelectorCall node and attach it to the call node.
• Extend AST parsing to convert .selector_call(...).attr into an attr(selector_call(...), "attr") call (and support |= via set_attr), mirroring existing .selector.attr behavior.
• Add AST/CST unit tests and integration tests covering .h(2).depth and .code("rust").lang end-to-end evaluation.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
crates/mq-lang/tests/integration_tests.rs	Adds end-to-end integration coverage for attribute access after selector calls.
crates/mq-lang/src/cst/parser.rs	Parses attribute selectors that directly follow selector-call argument lists and models them in the CST.
crates/mq-lang/src/ast/parser.rs	Desugars selector-call attribute access into attr(...) / set_attr(...) calls; adds parser unit tests.