Add hooks.context_warnings config option (default: true) that allows
users to disable the context monitor hook's advisory messages. When
set to false, the hook exits silently, allowing Claude Code to reach
auto-compact naturally without being interrupted.
This is useful for long unattended runs where users prefer Claude to
auto-compact and continue rather than stopping to warn about context.
Changes:
- hooks/gsd-context-monitor.js: Check config before emitting warnings
- get-shit-done/templates/config.json: Add hooks.context_warnings default
- get-shit-done/workflows/settings.md: Add UI for the new setting
Fixes#976