feat: Add Mistral Vibe support with before_tool hooks

[bashout]

Implement Mistral Vibe CLI integration using the experimental before_tool hook system introduced in Vibe 2.15.0. Closes #800

• Add hooks/vibe/ hook script and configuration
• Add Vibe installation/uninstallation functions
• Update documentation

Requires:

• Mistral Vibe >= 2.15.0
• enable_experimental_hooks = true in Vibe config

Test plan

Manual testing verified hook functioning within the Vibe CLI

Tested against prompt:

explain the most recent two commits. Dig into the code, understand the goal and evaluate the code quality and completeness of the features.

The following rewrites were made:

  1. rtk git log --oneline -2 --stat
  2. rtk git show 2ed8977 --no-color
  3. rtk git show 3d37217 --no-color
  4. rtk git diff 3d37217..2ed8977 -- src/hooks/init.rs
  5. rtk git show 3d37217:src/main.rs
  6. rtk git show 3d37217 -- src/main.rs
  7. rtk grep "VIBE_HOOKS_TOML" src/hooks/constants.rs
  8. rtk git show 3d37217:hooks/vibe/hooks.toml
  9. rtk read hooks/vibe/tests/test_vibe_hook.py
 10. rtk grep vibe src/hooks/init.rs

Output from rtk gain following implementation and integration with Vibe CLI

• cargo fmt --all && cargo clippy --all-targets && cargo test

test result: ok. 2201 passed; 0 failed; 8 ignored; 0 measured; 0 filtered out; finished in 0.49s