* feat(config): add no-install-hooks config to disable git hook installation
Add `no-install-hooks` boolean config that prevents git hook installation
during `bd init`. This can be set via:
- Environment variable: BD_NO_INSTALL_HOOKS=1
- Global config: ~/.config/bd/config.yaml with `no-install-hooks: true`
- Local config: .beads/config.yaml with `no-install-hooks: true`
The existing `--skip-hooks` flag continues to work and takes precedence.
Default behavior unchanged: hooks install by default.
* docs: add no-install-hooks to configuration documentation
- Add no-install-hooks to Supported Settings table in CONFIG.md
- Add example in config file section
- Add "Disabling Hook Installation" section to GIT_INTEGRATION.md
with examples for flag, env var, and config file methods
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