docs: migrate roadmap to structured yaml tasks

docs/roadmap/ROADMAP.yaml

@@ -0,0 +1,62 @@
+version: 1
+updated_at: 2026-03-24
+structure:
+  backlog_dir: docs/roadmap/backlog
+  in_progress_dir: docs/roadmap/in-progress
+  done_dir: docs/roadmap/done
+  blocked_dir: docs/roadmap/blocked
+  cancelled_dir: docs/roadmap/cancelled
+notes:
+  - ROADMAP.md is now a human-readable compatibility index.
+  - One task lives in one YAML file and changes state by moving between status folders.
+  - Priority ordering is maintained here so agents can parse one short file first.
+priority_queue:
+  - SEC-001
+  - SEC-001A
+  - CORE-001D
+  - BT-003B
+  - PORT-003
+  - BT-002
+  - BT-001C
+  - EXEC-001
+  - EXEC-002
+recently_completed:
+  - CORE-001A
+  - CORE-001B
+  - CORE-001C
+  - PORT-004
+  - BT-001A
+  - BT-003A
+states:
+  backlog:
+    - SEC-001
+    - SEC-001A
+    - DATA-002A
+    - DATA-001A
+    - OPS-001
+    - PORT-003
+    - EXEC-001
+    - EXEC-002
+    - BT-002
+    - BT-003
+    - BT-003B
+    - BT-001C
+    - CORE-001D
+  in_progress: []
+  done:
+    - DATA-001
+    - DATA-002
+    - DATA-003
+    - PORT-001
+    - PORT-001A
+    - PORT-002
+    - PORT-004
+    - EXEC-001A
+    - BT-001
+    - BT-001A
+    - BT-003A
+    - CORE-001A
+    - CORE-001B
+    - CORE-001C
+  blocked: []
+  cancelled: []