fix(rg): honor --no-context-separator between files

[chaliy]

Motivation

• rg honored --no-context-separator only for intra-file gaps but still emitted the context separator unconditionally before starting matches for a later file, causing output to differ from real ripgrep.

Description

• Gate inter-file context-separator emissions on !opts.no_context_separator in all three output paths (multiline inverted, multiline normal, and regular) in crates/bashkit/src/builtins/rg/mod.rs.
• Add a differential test case no context separator between files exercising -n -C1 --no-context-separator across two files to cover the regression.
• Update is small and localized to crates/bashkit/src/builtins/rg/mod.rs and the rg differential test table.

Testing

• Ran cargo test -p bashkit builtins::rg::tests -- --nocapture, which compiled and executed the rg tests; 46 tests passed and 1 test failed (diff_rg_matches_real_rg_cases) due to an existing timing-line mismatch with real rg that is unrelated to this fix.
• Attempted to sync with remote via git fetch origin main but it failed because this checkout has no origin remote configured.

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Codex Task

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	bashkit	99844e2	Commit Preview URL	May 25 2026, 02:36 AM