fix(hooks): don't create root dirs for uninstalled tools on hooks inject/remove

[jeff-r2026]

Problem

teamai hooks inject / hooks remove were silently creating root directories for AI tools the user never installed.

The default toolPaths includes internal agents like tclaude, tcodex, codex-internal. When a user ran hooks inject, empty ~/.tclaude/, ~/.tcodex/, ~/.codex-internal/ directories appeared out of nowhere — each with a settings.json/hooks.json and empty skills/rules/agents/ subdirs. Worse: once those root dirs existed, isToolInstalled treated the tools as installed, so subsequent teamai pulls copied skills into them too.

Root cause

hooks inject/remove passed force: true to reconcileHooksToAllTools (introduced in #135 to make clean-env E2E tests pass). force skipped the pathExists(toolRoot) gate, and reconcileHooks then created the root dir via ensureDir for every configured tool.

// before — force bypassed the installed check entirely
if (!opts.force) {
  const toolRoot = path.join(baseDir, paths.settings.split('/')[0]);
  if (!await pathExists(toolRoot)) continue;
}

force's only effect was bypassing this gate, so it's removed entirely. Hooks are now reconciled only into tools whose root directory already exists — consistent with skill/rule/agent sync and with injectHooksToAllTools (the pull/init path, which already gated correctly).

Changes

• src/hooks.ts: drop the force option; always gate each tool on root-dir existence
• src/hooks-cmd.ts: stop passing force: true from inject/remove
• Tests: pre-create installed tool dirs where they previously relied on force; add an e2e regression asserting uninstalled tool dirs are never created
• Docs: clarify inject/remove only touch installed tools (README + usage-guide, both languages)

Test Plan

• npx tsc --noEmit — clean
• npx vitest run — 1836 passed
• npx vitest run --config vitest.e2e.config.ts — 56 passed, 23 skipped
• New regression test does not create root directories for uninstalled tools (hooks-team-e2e) passes
• Real CLI e2e in a clean $HOME: only .claude (pre-installed) exists after hooks inject; .tclaude / .tcodex / .codex-internal / .cursor / .codex / .codebuddy are not created, and .claude/settings.json is written correctly

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