v0.1.14

Pre-flight auth check + live progress in ensemble (review, security-review, ensemble subcommand, and any per-tool ensemble routes).

New: pre-flight auth check
Before launching members in parallel, agentpit now runs `check_auth` against each one and prints a single warning block for anything that would be skipped:

```
⚠ skipping 1 member(s) with missing auth or transport:
[codex] Codex CLI is not logged in. Authenticate it once via OAuth.
→ members ready: gemini, opencode
```

If every member is skipped, the run aborts with a single "no members are ready (all skipped). Run `agentpit login ` to fix." error instead of N parallel failures.

New: live per-backend progress
Each member emits a `▶ [backend] running...` line when it starts and a `✓ [backend] done in X.Ys (N chars)` or `✗ [backend] failed in X.Ys: ` line when it finishes. Same for the aggregator. Output goes to stderr so the structured `=== ===` report on stdout is unaffected.