aix: synchronous fetch + git-status annotations + auto-pull if clean

Adds multi-machine sync awareness to the session launcher.

Before fzf:
- Fetches all candidate repos in parallel (capped at 6 concurrent)
- Annotates each entry with git status: (↑N ↓N dirty), (no upstream)
- Clean repos show no annotation

When launching a window:
- If working tree is clean, has upstream, is behind (not ahead): pull
- Otherwise: open window as-is, user handles any sync manually

Design choices:
- Fetches are synchronous — accurate status at the cost of a brief wait
  on session start. Parallel execution keeps it fast (~1-2s for 22 repos).
- Pull is --ff-only — never merges, never creates merge commits in aix
- Diverged repos (ahead AND behind) trigger no auto-action; user decides
- No stash/pop dance — unreliable in multi-project batches; prefer
  explicit awareness via annotation

Primary use case: moving between laptop and desktop. Wrap-it-up's
always-push ensures remote is current at session end; this ensures
local is current at next session start.

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