fix(lsp): relax initialize timeout floor

[ScriptedAlchemy]

Summary

• raise the LSP initialize response floor from 500ms to 1000ms
• keep the message IO timeout floor at 250ms so document-write/partial-frame timeout tests stay bounded

Why

• master CI on macOS failed after PR [codex] Speed up recent slow JUnit tests #243 because Python-backed fake LSP startup sometimes exceeded the 500ms initialize floor after timeout-heavy tests

Tests

• cargo fmt -- --check
• cargo test -q --test hooks_lsp_suite lsp_code_diagnostics_test::broker_
• cargo test -q --test hooks_lsp_suite
• git diff --check
• scripts/check-conventional-commits.sh origin/master..HEAD

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Latest commit: 889b3a9

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