docs: restructure TASKS.md into a catalog — one file per task in TASKS/

TASKS.md is now the index (status table, open items, research pointer).
33 files: 32 task files + 1 research facts file. The full take-saga
narrative and all design decisions are preserved verbatim; the catalog
makes the queue readable without opening every task body. Schema and
AGENTS.md updated to reflect the new layout.

TASKS/task-13-social-launch-kit.md

@@ -0,0 +1,19 @@
+# TASK 13 — Social media launch kit
+
+> Catalog: [`TASKS.md`](../TASKS.md) — status and requirements live here.
+
+
+**Goal:** marcom/social media assets and strategy for v1 launch.
+
+**Business details (positioning, messaging, platform strategy, launch assets) in `MARCOM.md` (gitignored).**
+
+### Status: 🔶 Scoped — nothing built; queued after all v1 features ship
+
+1. ☐ Product positioning & messaging (one-liner, elevator pitch, competitive positioning)
+2. ☐ Social media swipe files (pre-written posts for supporters)
+3. ☐ Launch day assets (demo video, screenshots, GIFs, social graphics, press kit)
+4. ☐ Platform strategy (YouTube, Reddit, indie dev communities, Product Hunt)
+5. ☐ Founder story (67-year-old dev building his own streaming app)
+6. ☐ Email announcement templates
+7. ☐ "Build in public" livestream angle (stream the coding of ytLlive with ytLlive)
+