feat: Woodpecker CI pipeline + project docs (P0-007, P0-008)

Add Woodpecker CI with install, typecheck, lint, format, test, and
build steps. Add CLAUDE.md for Claude Code sessions. Update AGENTS.md
with project-specific package map and architecture rules.

Closes #7, Closes #8

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.woodpecker/ci.yml

@@ -0,0 +1,57 @@
+variables:
+  - &node_image 'node:22-alpine'
+  - &install_deps |
+    corepack enable
+    pnpm install --frozen-lockfile
+
+when:
+  - event: [push, pull_request, manual]
+
+steps:
+  install:
+    image: *node_image
+    commands:
+      - *install_deps
+
+  typecheck:
+    image: *node_image
+    commands:
+      - *install_deps
+      - pnpm typecheck
+    depends_on:
+      - install
+
+  lint:
+    image: *node_image
+    commands:
+      - *install_deps
+      - pnpm lint
+    depends_on:
+      - install
+
+  format:
+    image: *node_image
+    commands:
+      - *install_deps
+      - pnpm format:check
+    depends_on:
+      - install
+
+  test:
+    image: *node_image
+    commands:
+      - *install_deps
+      - pnpm test
+    depends_on:
+      - install
+
+  build:
+    image: *node_image
+    commands:
+      - *install_deps
+      - pnpm build
+    depends_on:
+      - typecheck
+      - lint
+      - format
+      - test