L37 — Request input key completion from validation rules

[shuvroroy]

Inside $request->input('…') and its siblings, the acceptable field names are the keys of the rules array that validates the request. PHPantom now reads that array — from a FormRequest's rules() or a validate() / Validator::make() call earlier in the same method — and offers those keys as completion, with go-to-definition to the rule that declares them.

Two commits: a preparatory refactor that shares the open-quote scan between string detectors, then the feature. See the commit messages for the details.

Worth a reviewer's attention:

• Dispatch order. Request-key completion runs after the Eloquent strategies, because has() is both a request accessor and a relation method. A builder subject resolves as a relation first; only a request-typed subject falls through.
• Module placement. Rules extraction lives in virtual_members/laravel/validation_rules.rs, separate from the completion surface, so L38 (typed validated() array shapes) can reuse it. L38's backlog entry now points at it.
• StringCallContext gained a call_open_paren field. It ships with the feature rather than the refactor commit because an unused pub(crate) field trips dead_code and would fail clippy -D warnings on its own.

Checklist

If applicable:

• I have updated CHANGELOG.md
• I have updated the documentation (README.md, docs/, examples/)
• I have updated the config schema (config-schema.json) — no new config options
• I have added/updated tests to cover my changes

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 93.03079% with 43 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/virtual_members/laravel/validation_rules.rs	88.92%	39 Missing ⚠️
src/virtual_members/laravel/request_fields.rs	98.93%	2 Missing ⚠️
src/completion/laravel_request_keys.rs	97.22%	1 Missing ⚠️
src/completion/source/helpers.rs	96.00%	1 Missing ⚠️

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[shuvroroy]

@AJenbo I think test are failing because of some permission issue. Can you please confirm that?

[AJenbo]

The benchmark fails for outsiders, hvaen't fully investigated if there is a solution, but it's not important for now.

[AJenbo]

Thanks for working on this