chore: remove obsolete hookify rules

[hyldmo]

Summary

• remove the dead repo-local Hookify rules and their documentation
• remove the redundant save-learnings reminder hook while preserving the Stop hook

These rules now live in the operator's global hook ~/.claude/hooks/bash-command-guard.mts, which blocks rm with a force flag, npx, and gcloud, and warns before git commit.

The old no-git-c-flag rule was dropped on purpose. The new hook matches the command in command position and checks flags across all arguments, so rm foo.bar -rf is caught while echo "rm -rf x" is allowed. Its npx message names both yarn and bun, so it stays correct in this repo.

Validation

• grep -ri hookify . returns no matches
• .claude/settings.json parses as valid JSON

[github-actions]

🎉 This PR is included in version 2.19.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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