feat(mcpedia): Phase 1 MVP — monorepo, Core, Web UI, MCP server, Postgres FTS

- bun workspaces + Turborepo monorepo (apps/web, apps/mcp; packages/*, scripts)
- @mcpedia/core single business-logic layer (Document/Content/Search services)
- @mcpedia/db Drizzle schema: documents + weighted tsvector (GIN) for FTS
- @mcpedia/parser frontmatter, @mcpedia/search Postgres FTS (ts_rank+ts_headline)
- Next.js 16 Web UI (home/doc SSG, search dynamic) + react-markdown render
- MCP server (stdio) with 4 tools + in-memory smoke test
- scripts/indexer walks content/ -> upserts into Postgres
- 4 seed docs; README + PHASES status

content/notes/typescript/patterns.md

@@ -0,0 +1,36 @@
+---
+id: typescript-patterns
+title: TypeScript Patterns
+type: note
+tags:
+  - typescript
+  - patterns
+status: published
+author: asep
+created_at: 2026-08-19
+updated_at: 2026-08-19
+---
+
+# TypeScript Patterns
+
+A notebook of small, reusable TypeScript patterns that keep code honest.
+
+## Branded types for ids
+
+```ts
+type DocId = string & { readonly __brand: "DocId" };
+const asDocId = (s: string) => s as DocId;
+```
+
+Branding prevents passing an arbitrary string where a document id is expected.
+
+## Discriminated unions over inheritance
+
+Prefer a closed set of variants with a `kind` field. Exhaustiveness checks with
+`switch` catch missing cases at compile time instead of at runtime.
+
+## Prefer composition
+
+When two modules share behavior, extract a function. Avoid inheritance trees
+that couple unrelated code. This matches the MCPedia Core principle: one layer
+owns the logic, interfaces only call into it.