Replace NOTES.md with structured TODO.md

Extract bugs, open tasks, and cross-surface improvements into TODO.md
with clear sections (Bugs, TUI, Cross-surface, Done). Content that
was already documented elsewhere (archived board semantics, MCP URIs,
SSE, dashboard plans) is dropped. All completed items preserved in
Done section.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bricef

NOTES.md

@@ -0,0 +1,35 @@
+# TODO
+
+Outstanding tasks and known issues. See [docs/plans/active/](docs/plans/active/) for larger planned work.
+
+## Bugs
+
+- [ ] **TUI resize**: resizing the terminal (especially making it larger) causes layout issues — kanban columns, event log, and viewport don't reliably recalculate dimensions
+- [ ] **TUI space below help**: a line of dead space at the bottom of the terminal
+
+## TUI
+
+- [ ] Filter bar: filter tasks by assignee, priority, tags, state — applies to both kanban and list views
+- [ ] Dependency tree visualisation in task detail view
+- [ ] Mouse support (using [bubblezone](https://github.com/lrstanley/bubblezone))
+
+See also [TUI improvements plan](docs/plans/active/2026-03-31-tui-improvements.md) for page scrolling, searchable selectors, @me shortcut, and take action.
+
+## Cross-surface
+
+- [ ] "My tasks" view: integrate cross-board `@me` filter into TUI (new tab or filter mode) and dashboard
+- [ ] Board overview in TUI board selector: show task counts by state when selecting a board
+- [ ] Transition error context in CLI/TUI: show available transitions in error messages (API already returns them)
+
+## Done
+
+- [x] MCP server with auto-derived tools, resources, notifications, whoami, task_ref
+- [x] TUI global event stream with per-board ring buffers
+- [x] Structured error responses with available transitions on failure
+- [x] Batch operations (POST /batch)
+- [x] Webhook dispatch with HMAC-SHA256 signatures
+- [x] @me actor alias for self-assignment
+- [x] Cross-board task search (GET /tasks)
+- [x] Idempotency keys for safe retries
+- [x] List view with sortable columns
+- [x] Workflow graph visualisation