fix(rg): apply max-count after multiline invert

[chaliy]

Motivation

• Multiline --invert-match was passing opts.max_count into positive-span collection, truncating positive spans before inversion and producing too much inverted output.
• Goal is to match ripgrep semantics: collect all positive multiline spans, then apply -m/--max-count to the inverted result.

Description

• In crates/bashkit/src/builtins/rg/mod.rs call collect_rg_multiline_matches with None when opts.invert_match so positive spans are fully collected instead of truncated by opts.max_count.
• After building inverted_match_lines, apply opts.max_count by truncating the vector to enforce the max-count limit on inverted output.
• Added a focused regression test test_rg_multiline_invert_max_count in crates/bashkit/src/builtins/rg/mod.rs that verifies -m 1 -v -U 'foo\nbar' returns only the first inverted line.

Testing

• Added unit test test_rg_multiline_invert_max_count which reproduces the reported regression and asserts expected output.
• Ran cargo test -p bashkit test_rg_multiline_invert_max_count -- --nocapture and the test passed (1 passed; 0 failed).

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Codex Task

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	bashkit	842647e	Commit Preview URL	May 25 2026, 04:31 PM