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When Trump posts an actionable buy/short signal, instantly tweet the call (entry/direction, hard time window, "ratio me" hook), then post a result follow-up X_FOLLOWUP_MINUTES later reporting the realised 15-min move plus a recent hit-rate brag with the site link. - New app/services/x_poster.py: OAuth 1.0a signed (stdlib hmac, no new dep, httpx reused). Fire-and-forget, fully degradable — no-op unless X creds + x_enabled. Dry-run logs tweet text. In-memory UTC-daily cap. 280-char hard cap on all templates (no Premium). - Gated to source=truth buy/short above x_min_confidence; scanner signals excluded (don't fit the "Trump just posted" format). - Hooked next to notify_signal in /signals/ingest + both Trump pollers (dedup via unique external_id → single tweet per post). - config.py + .env.example: X_API_KEY/SECRET, X_ACCESS_TOKEN/SECRET, X_ENABLED, X_MIN_CONFIDENCE, X_DAILY_CAP, X_FOLLOWUP_MINUTES, X_LINK_URL. 72 tests pass. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>