test(live): add live CLI suite

docs/testing.md

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+# Testing
+
+## Unit tests (default)
+- `pnpm test`
+
+## Live tests (hits Twitter/X)
+
+Runs the CLI against real Twitter/X GraphQL endpoints to verify read-only commands still work.
+
+Requirements:
+- Auth cookies in env:
+  - `AUTH_TOKEN` (or `TWITTER_AUTH_TOKEN`)
+  - `CT0` (or `TWITTER_CT0`)
+- Network access
+
+Run:
+- `pnpm test:live`
+
+Notes:
+- Live tests are skipped unless `BIRD_LIVE=1` (set by `pnpm test:live`).
+- Search query is configurable via `BIRD_LIVE_SEARCH_QUERY`.
+- Command timeout is configurable via `BIRD_LIVE_TIMEOUT_MS` (ms).
+- Cookie extraction timeout is configurable via `BIRD_LIVE_COOKIE_TIMEOUT_MS` (ms).
+- Spawned CLI `NODE_ENV` defaults to `production` (override with `BIRD_LIVE_NODE_ENV`).
+- If you don't tweet, set `BIRD_LIVE_TWEET_ID` to a known tweet ID to use for `read/replies/thread`.
+- Optional: set `BIRD_LIVE_BOOKMARK_FOLDER_ID` to exercise `bookmarks --folder-id`.
+- `bird query-ids --fresh` live coverage: set `BIRD_LIVE_QUERY_IDS_FRESH=1`.