ktext install-hooks: automatically write agent session hooks

[thegagne]

Idea

After running ktext init, users still have to manually create .claude/settings.json (and equivalent files for other tools) to get automatic context loading at session start. This friction means most users probably won't do it.

A new subcommand could handle this:

ktext install-hooks claude       # write .claude/settings.json
ktext install-hooks cursor       # write .cursor/rules instruction line
ktext install-hooks copilot      # write .github/copilot-instructions.md instruction line
ktext install-hooks all          # write all of the above

What each would do

Claude Code — create or merge into .claude/settings.json:

{
  "hooks": {
    "SessionStart": [
      {
        "matcher": "startup|compact",
        "hooks": [{ "type": "command", "command": "ktext export xml" }]
      }
    ]
  }
}

Other tools — append a single line to the instruction file if not already present:

Run `ktext export xml` at the start of every session to load project context.

Considerations

• Should be idempotent — running twice doesn't duplicate entries
• Should not overwrite existing hook config, only add to it (merge for JSON, append-if-absent for flat files)
• Should print what it wrote and where
• ktext init could prompt "install agent hooks now?" at the end as a natural follow-on step
• Need to decide whether .claude/settings.json is the right target or whether .claude/settings.local.json (not committed) makes more sense for some users

Open questions

• Should hooks be committed to the repo (shared with contributors) or local-only?
• Is install-hooks the right name, or something like ktext setup or ktext integrate?
• How do we handle tools that don't exist on the user's machine — skip silently or warn?