Monorepo support: hooks fail when running aspens in a subdirectory

[mvoutov]

Command

aspens doc init

What happened?

When running aspens doc init from a subdirectory of a monorepo
(e.g. repo/backend/), docs and hooks are generated correctly in
backend/.claude/. However:

1. Hook paths break — settings.json uses
   $CLAUDE_PROJECT_DIR/.claude/hooks/..., but Claude Code sets
   CLAUDE_PROJECT_DIR to the git root (e.g. repo/), not the cwd
   where claude was launched. So the hooks resolve to
   repo/.claude/hooks/... instead of repo/backend/.claude/hooks/...,
   causing UserPromptSubmit hook error on every prompt.
2. aspens doc sync fails — Running aspens doc sync --install-hook
   from the subdirectory returns Error: Not a git repository
   because .git/ lives at the parent.

Environment:

• Monorepo: tutor/ (git root) with tutor/backend/ and
  tutor/frontend/ as separate projects
• aspens v0.6.0
• Claude Code on macOS

Workaround:
Replace $CLAUDE_PROJECT_DIR with a hardcoded absolute path or the
subdirectory-relative path in settings.json.

What did you expect?

Expected behavior:

• Hook paths should account for subdirectory offset from git root
  (e.g. $CLAUDE_PROJECT_DIR/backend/.claude/hooks/...)
• aspens doc sync should walk up to find .git/ or accept a
  --git-root flag

Steps to reproduce

No response

Node.js version

No response

OS

No response

Additional context

No response

[mvoutov]

fix with commit #39