Fix find native expression passthrough

[serrebidev]

Summary

• pass native find expressions/actions through to real find instead of rejecting or partially compacting them
• preserve shared AI hook rewrites for Claude, Cursor, Gemini, VS Code Copilot, and Copilot CLI while keeping instruction-only agents on the fixed binary path
• avoid rtk find broken-pipe panics when compact output is piped to commands like head

Verification

• cargo fmt --check
• cargo test find_cmd
• cargo test test_hook_formats_rewrite_native_find_passthrough_command
• cargo test test_rewrite_find_native_expression_passthrough_safe
• cargo test
• live: rtk find . \( -name '*.rs' -o -name '*.toml' \) -printf '%p\\n' | head -n 5
• live: rtk find . -m 10000 | head -n 1

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