docs: add CLAUDE.md for AI assistant context

Documents BeadBoard architecture, commands, verification gates,
data flow, key directories, and Windows considerations for
AI assistants working on this codebase.

CLAUDE.md

@@ -0,0 +1,84 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## What Is BeadBoard
+
+BeadBoard is a Windows-native local dashboard for the [Beads](https://github.com/steveyegge/beads) issue tracker. It reads `.beads/issues.jsonl` files directly from repos and renders them as interactive Kanban boards and dependency graphs. It supports multi-project aggregation, real-time file watching with SSE, and agent/swarm coordination.
+
+## Commands
+
+```bash
+npm run dev          # Start Next.js dev server (localhost:3000)
+npm run build        # Production build
+npm run typecheck    # tsc --noEmit
+npm run lint         # eslint
+npm run test         # Runs all tests (explicitly enumerated in package.json)
+```
+
+Run a single test:
+```bash
+node --import tsx --test tests/lib/parser.test.ts
+```
+
+**New test files must be added to the `test` script in `package.json`** — the suite is explicitly enumerated, not auto-discovered.
+
+## Verification gates (run before closing any code bead)
+
+```bash
+npm run typecheck && npm run lint && npm run test
+```
+
+## Architecture
+
+**Stack**: Next.js 15 (App Router) · React 19 · Tailwind CSS · TypeScript (strict) · @xyflow/react (graphs) · Dagre (layout) · Chokidar (file watching) · Remotion (video generation)
+
+### Data flow
+
+1. **Source of truth**: `.beads/issues.jsonl` files on disk, mutated only via `bd` CLI commands.
+2. **Parser** (`src/lib/parser.ts`): Reads JSONL, normalizes dependencies and fields into `BeadIssue` objects.
+3. **Aggregate read** (`src/lib/aggregate-read.ts`): Merges issues across multiple project roots based on project scope/mode.
+4. **Realtime** (`src/lib/realtime.ts`): `IssuesEventBus` singleton dispatches change events. SSE endpoint (`src/app/api/events/route.ts`) streams them to the browser.
+5. **Watcher** (`src/lib/watcher.ts`): Chokidar-based `IssuesWatchManager` watches JSONL + WAL + `.last_touched` files, coalesces events via `ProjectEventCoalescer`, and emits through the event bus. Snapshot diffing detects per-issue changes.
+6. **Writeback** (`src/lib/writeback.ts`): API mutations write back to JSONL through `bd`-compatible paths.
+
+### Key directories
+
+- `src/app/` — Next.js App Router pages and API routes
+  - `/` — Kanban dashboard (main page)
+  - `/graph` — Dependency graph explorer using @xyflow/react + Dagre
+  - `/sessions` — Agent session management
+  - `/timeline` — Timeline view
+  - `/api/beads/` — CRUD endpoints for beads (create, read, update, close, reopen, comment)
+  - `/api/events/` — SSE endpoint for real-time updates
+  - `/api/swarm/` — Swarm coordination endpoints (create, launch, join, leave, status, templates)
+  - `/api/mission/` — Mission/epic management endpoints
+  - `/api/agents/` — Agent registry endpoints
+- `src/components/` — UI components organized by feature (kanban, graph, sessions, swarm, shared, etc.)
+  - `shared/unified-shell.tsx` — Main layout shell wrapping all pages (top bar, left panel, right panel)
+- `src/lib/` — Core logic (parser, types, pathing, watcher, realtime, registry, scanner, mutations, graph layout)
+  - `types.ts` — Central type definitions (`BeadIssue`, `BeadStatus`, `ProjectContext`, etc.)
+  - `pathing.ts` — Windows path canonicalization (drive letter normalization, path keys)
+  - `bd-path.ts` — Resolves the `bd` CLI binary path
+- `src/hooks/` — React hooks for subscriptions (`use-beads-subscription`, `use-swarm-list`, `use-url-state`, etc.)
+- `components/ui/` — shadcn/ui primitives
+- `tests/` — Node.js native test runner with tsx loader; mirrors src structure
+- `scripts/` — CLI utilities (`bb.ts` — BeadBoard CLI, Playwright capture scripts)
+- `docs/` — RFCs, ADRs, protocols, and feature specs
+
+### Path alias
+
+`@/*` maps to the project root (configured in `tsconfig.json`).
+
+### Windows considerations
+
+- All path handling must canonicalize Windows paths (drive letter casing, backslash normalization). Use `canonicalizeWindowsPath` and `windowsPathKey` from `src/lib/pathing.ts`.
+- Webpack filesystem cache is disabled in dev mode (`next.config.ts`) to avoid Windows ENOENT errors.
+
+### ESLint config
+
+`@typescript-eslint/no-explicit-any` and `prefer-const` are intentionally turned off. `eslint.config.mjs` uses flat config with `next/core-web-vitals` and `next/typescript`.
+
+## Beads workflow
+
+Use `bd` as the sole interface for mutating beads. Never write to `.beads/issues.jsonl` directly. See `AGENTS.md` for the full operating manual including dependency discipline, parallel agent patterns, and session completion protocol.