feat: add TypeBox/Ajv config schema package to the workspace (E00-S04-T01)

Adds packages/config (@personal-blog/config) — the EPPP configuration
service foundation. The package defines the configuration schema with
TypeBox (configSchema: host, port, databaseUrl, sessionSecret — the
validated config fields, golden-tuple pins @sinclair/typebox@0.34.52 and
ajv@8.20.0) and compiles it with Ajv (validateConfig). The environment
adapter (T04), field-specific startup errors (T02) and secret redaction
(T03) build on this boundary in later tasks; nothing reads process.env yet.

Wiring for the new workspace package: lockfile importer + resolved
typebox/ajv tree, apps/server/Dockerfile manifest copy (frozen in-image
install must match the lockfile importers), config-schema CI job, package
set fixtures (workspace-layout, workspace-config, strict-tsconfig,
typescript-pin), probe-file gitignore entry.

.gitea/workflows/ci.yml

@@ -167,6 +167,33 @@ jobs:
       - name: Run app readiness test suite
         run: node --test tests/app-readiness.test.mjs
 
+  # E00-S04-T01: the static assertions of tests/config-schema.test.mjs gate
+  # every PR — the suite locks in the TypeBox/Ajv configuration schema
+  # (packages/config, golden-tuple pins @sinclair/typebox@0.34.52 +
+  # ajv@8.20.0) with mutation probes, and the deterministic probe executes
+  # the issue's test plan ("validate a full config against the TypeBox/Ajv
+  # schema") against the committed schema through Ajv. The job installs the
+  # frozen workspace and builds the config package because the probe also
+  # exercises the compiled package boundary (@personal-blog/config) exactly
+  # as the later configuration adapter will consume it.
+  config-schema:
+    name: TypeBox/Ajv config schema (E00-S04-T01)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Node.js 24
+        uses: actions/setup-node@v4
+        with:
+          node-version: '24'
+      - name: Enable pnpm (corepack, pinned to 11.23.0 via packageManager)
+        run: corepack enable
+      - name: Install dependencies (frozen lockfile)
+        run: pnpm install --frozen-lockfile
+      - name: Build the config package (the probe exercises the compiled package boundary)
+        run: pnpm --filter @personal-blog/config build
+      - name: Run config schema test suite
+        run: node --test tests/config-schema.test.mjs
+
   # E00-S03-T01: the static assertions of tests/compose-config.test.mjs (db
   # image pinned to postgres:18.6-bookworm, health gate, volume persistence,
   # build platforms) gate every PR (the docker-gated real-stack probes inside

.gitignore

@@ -19,5 +19,9 @@ coverage/
 .lock-probe-*.mjs
 .diagnostic-probe-*.mjs
 
+# Transient host-side probe file written by the config-schema test suite into
+# the package (removed in its finally block)
+.config-schema-probe-*.mjs
+
 # OS / editor
 .DS_Store

apps/server/Dockerfile

@@ -57,11 +57,12 @@ RUN corepack enable
 # invalidate the dependency layer, then install against the committed lockfile
 # (the same `--frozen-lockfile` path CI and developers use). Every workspace
 # package manifest is copied so the in-image workspace matches the lockfile
-# importers exactly (apps/server, packages/core, packages/database-postgres,
+# importers exactly (apps/server, packages/core, packages/config,
-# extensions/example).
+# packages/database-postgres, extensions/example).
 COPY package.json pnpm-lock.yaml pnpm-workspace.yaml tsconfig.base.json ./
 COPY apps/server/package.json apps/server/package.json
 COPY packages/core/package.json packages/core/package.json
+COPY packages/config/package.json packages/config/package.json
 COPY packages/database-postgres/package.json packages/database-postgres/package.json
 COPY extensions/example/package.json extensions/example/package.json
 RUN pnpm install --frozen-lockfile

packages/config/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "@personal-blog/config",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "description": "EPPP configuration service. Owns the TypeBox/Ajv configuration schema (E00-S04-T01); the environment adapter (E00-S04-T04), field-specific startup errors (E00-S04-T02), secret redaction (E00-S04-T03) and the .env.example template (E00-S04-T05) land in later tasks.",
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "typecheck": "tsc -p tsconfig.json --noEmit"
+  },
+  "dependencies": {
+    "@sinclair/typebox": "0.34.52",
+    "ajv": "8.20.0"
+  },
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    }
+  }
+}

packages/config/src/index.ts

@@ -0,0 +1,14 @@
+/**
+ * @personal-blog/config — EPPP configuration service.
+ *
+ * [E00-S04-T01] TypeBox/Ajv schema: the package boundary exposes the
+ * configuration schema (`configSchema`, defined with TypeBox) and the Ajv
+ * schema-validation entry point (`validateConfig`). The environment adapter
+ * (E00-S04-T04), field-specific startup errors (E00-S04-T02) and secret
+ * redaction (E00-S04-T03) build on this boundary in later tasks.
+ */
+
+export { configSchema } from './schema.js';
+export type { Config } from './schema.js';
+export { validateConfig } from './validate.js';
+export type { ConfigValidationResult } from './validate.js';

packages/config/src/schema.ts

@@ -0,0 +1,52 @@
+/**
+ * EPPP configuration schema — [E00-S04-T01] TypeBox/Ajv schema.
+ *
+ * The single source of truth for the **validated configuration fields** of
+ * the EPPP server (the `@personal-blog/config` package). The schema is
+ * defined with TypeBox (`@sinclair/typebox`, golden-tuple pin 0.34.52 —
+ * Technology-Stack §5.2/§7) and validated with Ajv (`ajv`, golden-tuple pin
+ * 8.20.0) via `validateConfig` (see `validate.ts`). E00-S04-T02
+ * (field-specific startup errors), T03 (secret redaction), T04 (the
+ * `process.env` adapter) and T05 (`.env.example` placeholders) build on this
+ * schema; this module only defines it.
+ *
+ * The validated config fields:
+ *
+ * - `host` — the interface the HTTP server binds. Default `0.0.0.0` (the
+ *   committed server binds all interfaces today, E00-S02-T03). Environment
+ *   source: `HOST`.
+ * - `port` — the port the HTTP server listens on. Integer in the valid TCP
+ *   port range (1–65535), default `3000` (the container default, matching
+ *   the Dockerfile `EXPOSE 3000` and the compose `:3000` container port;
+ *   `PORT` is read today, E00-S02-T03).
+ * - `databaseUrl` — the PostgreSQL connection string (the `pg` `Pool`
+ *   `connectionString`, E00-S03-T02). Optional: when absent the app has no
+ *   startup migration run to wait for and reports ready immediately (the
+ *   local non-container developer path, E00-S01-T06/E00-S03-T06). Must be
+ *   non-empty when present. Environment source: `DATABASE_URL`.
+ * - `sessionSecret` — the admin-session secret (`EPPP_SESSION_SECRET`, the
+ *   required secret per Security-and-Operations §32/§26). **Required** and at
+ *   least 32 characters: it is the story's secret field (E00-S04-T03 redacts
+ *   it from logs) and the schema's required field (E00-S04-T02 reports a
+ *   missing required setting). No default — a secret must never be invented
+ *   by the schema.
+ *
+ * The object is closed (`additionalProperties: false`) so a typo'd or
+ * unexpected setting is rejected loudly instead of silently ignored.
+ */
+
+import { Type, type Static } from '@sinclair/typebox';
+
+/** The EPPP configuration schema — validates the parsed configuration object. */
+export const configSchema = Type.Object(
+  {
+    host: Type.Optional(Type.String({ default: '0.0.0.0' })),
+    port: Type.Optional(Type.Integer({ minimum: 1, maximum: 65535, default: 3000 })),
+    databaseUrl: Type.Optional(Type.String({ minLength: 1 })),
+    sessionSecret: Type.String({ minLength: 32 }),
+  },
+  { additionalProperties: false },
+);
+
+/** The validated configuration type — `Static` of `configSchema`. */
+export type Config = Static<typeof configSchema>;

packages/config/src/validate.ts

@@ -0,0 +1,49 @@
+/**
+ * EPPP configuration validation — [E00-S04-T01] TypeBox/Ajv schema.
+ *
+ * Compiles the TypeBox `configSchema` with Ajv (the golden-tuple validator,
+ * Technology-Stack §5.2/§7) and exposes `validateConfig`, the generic
+ * schema-validation entry point: given an unknown value it reports whether
+ * the value is a valid configuration and the Ajv error messages otherwise.
+ *
+ * This is deliberately NOT the E00-S04-T02 field-specific startup error:
+ * `validateConfig` returns the raw schema-validation outcome (valid or not,
+ * with the Ajv messages) and performs no startup wiring — the adapter
+ * (E00-S04-T04) and the startup error formatting (E00-S04-T02) build on it
+ * in later tasks.
+ */
+
+import { Ajv } from 'ajv';
+
+import { configSchema } from './schema.js';
+
+/** Ajv instance for the config schema — `allErrors` reports every violation. */
+const ajv = new Ajv({ allErrors: true });
+
+/** The compiled validator — TypeBox schemas are JSON Schema, so Ajv compiles them directly. */
+const validateConfigValue = ajv.compile(configSchema);
+
+/** The outcome of validating a value against the config schema. */
+export interface ConfigValidationResult {
+  /** True when the value is a valid configuration. */
+  valid: boolean;
+  /** Ajv error messages, empty when `valid` is true. */
+  errors: string[];
+}
+
+/**
+ * Validates an unknown value against the config schema.
+ *
+ * @param value - the value to validate (typically the parsed config object)
+ * @returns `{ valid: true, errors: [] }` for a valid configuration, or
+ *   `{ valid: false, errors }` with the Ajv messages naming each violation
+ *   (e.g. `"must have required property 'sessionSecret'"`).
+ */
+export function validateConfig(value: unknown): ConfigValidationResult {
+  const valid = validateConfigValue(value);
+  if (valid) {
+    return { valid: true, errors: [] };
+  }
+  const errors = (validateConfigValue.errors ?? []).map((error) => error.message ?? 'invalid');
+  return { valid: false, errors };
+}

packages/config/tsconfig.json

@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "dist"
+  },
+  "include": ["src"]
+}

pnpm-lock.yaml

@@ -24,6 +24,15 @@ importers:
 
   extensions/example: {}
 
+  packages/config:
+    dependencies:
+      '@sinclair/typebox':
+        specifier: 0.34.52
+        version: 0.34.52
+      ajv:
+        specifier: 8.20.0
+        version: 8.20.0
+
   packages/core: {}
 
   packages/database-postgres:
@@ -41,12 +50,27 @@ importers:
 
 packages:
 
+  '@sinclair/typebox@0.34.52':
+    resolution: {integrity: sha512-XiMQh7qqVlxZzcVD+kkGMNGMzcTrDMLWI7S4x7z1MkCkbDPrekpZXEUK0eZqZFMuHQg2a2DZOcDIh9o5v3Gonw==}
+
   '@types/node@24.13.3':
     resolution: {integrity: sha512-Dh8vAsV36ig5wa9OX4pXvMc9D3Veibfw2wix0CUwYODLD8nkj9UsLjASr49nPg+2eKzxhBV+v7L8pXvT4e639Q==}
 
   '@types/pg@8.21.0':
     resolution: {integrity: sha512-AYdtudzabjLZgVgRZmAnU8bAnVUXzuJX2IYHeSIiIHm68olD+LgQYCGWdtcNYnP0uq9c4S4NibVG3Ni7VbKW7Q==}
 
+  ajv@8.20.0:
+    resolution: {integrity: sha512-Thbli+OlOj+iMPYFBVBfJ3OmCAnaSyNn4M1vz9T6Gka5Jt9ba/HIR56joy65tY6kx/FCF5VXNB819Y7/GUrBGA==}
+
+  fast-deep-equal@3.1.3:
+    resolution: {integrity: sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==}
+
+  fast-uri@3.1.6:
+    resolution: {integrity: sha512-7Ical1vFEMr0onbVzEDIreM22I4khW+fzyQPwvAFWBp1iwdshSZRsL4jjRvPG9JP1uiqMHRto+YU6R2/CzDz5Q==}
+
+  json-schema-traverse@1.0.0:
+    resolution: {integrity: sha512-NM8/P9n3XjXhIZn1lLhkFaACTOURQXjWhV4BA/RnOv8xvgqtqpAX9IO4mRQxSx1Rlo4tqzeqb0sOlruaOy3dug==}
+
   kysely@0.29.4:
     resolution: {integrity: sha512-y5mVgQNkMbs1eK9Xyc0pmNdabN2wHhRYY/5r4W5HrUT1rYCEPeVNSj1RUJeSDKT3U0p+mXCvLgkrFuIafYI6BA==}
     engines: {node: '>=22.0.0'}
@@ -101,6 +125,10 @@ packages:
     resolution: {integrity: sha512-9ZhXKM/rw350N1ovuWHbGxnGh/SNJ4cnxHiM0rxE4VN41wsg8P8zWn9hv/buK00RP4WvlOyr/RBDiptyxVbkZQ==}
     engines: {node: '>=0.10.0'}
 
+  require-from-string@2.0.2:
+    resolution: {integrity: sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw==}
+    engines: {node: '>=0.10.0'}
+
   split2@4.2.0:
     resolution: {integrity: sha512-UcjcJOWknrNkF6PLX83qcHM6KHgVKNkV62Y8a5uYDVv9ydGQVwAHMKqHdJje1VTWpljG0WYpCDhrCdAOYH4TWg==}
     engines: {node: '>= 10.x'}
@@ -119,6 +147,8 @@ packages:
 
 snapshots:
 
+  '@sinclair/typebox@0.34.52': {}
+
   '@types/node@24.13.3':
     dependencies:
       undici-types: 7.18.2
@@ -129,6 +159,19 @@ snapshots:
       pg-protocol: 1.16.0
       pg-types: 2.2.0
 
+  ajv@8.20.0:
+    dependencies:
+      fast-deep-equal: 3.1.3
+      fast-uri: 3.1.6
+      json-schema-traverse: 1.0.0
+      require-from-string: 2.0.2
+
+  fast-deep-equal@3.1.3: {}
+
+  fast-uri@3.1.6: {}
+
+  json-schema-traverse@1.0.0: {}
+
   kysely@0.29.4: {}
 
   pg-cloudflare@1.4.0:
@@ -176,6 +219,8 @@ snapshots:
     dependencies:
       xtend: 4.0.2
 
+  require-from-string@2.0.2: {}
+
   split2@4.2.0: {}
 
   typescript@6.0.3: {}

tests/strict-tsconfig.test.mjs

@@ -37,7 +37,7 @@ const REPO_ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..
 const read = (relPath) => readFileSync(path.join(REPO_ROOT, relPath), 'utf8');
 
 /** The workspace packages that must compile under the strict base config. */
-const WORKSPACE_PACKAGES = ['apps/server', 'packages/core', 'packages/database-postgres', 'extensions/example'];
+const WORKSPACE_PACKAGES = ['apps/server', 'packages/core', 'packages/config', 'packages/database-postgres', 'extensions/example'];
 
 /** The strict-family flags the committed base config must set. */
 const STRICT_FAMILY_FLAGS = [

tests/typescript-pin.test.mjs

@@ -33,7 +33,7 @@ const read = (relPath) => readFileSync(path.join(REPO_ROOT, relPath), 'utf8');
 const PINNED_TYPESCRIPT = '6.0.3';
 
 /** Every workspace package that must resolve the pinned TypeScript version. */
-const WORKSPACE_PACKAGES = ['apps/server', 'packages/core', 'packages/database-postgres', 'extensions/example'];
+const WORKSPACE_PACKAGES = ['apps/server', 'packages/core', 'packages/config', 'packages/database-postgres', 'extensions/example'];
 
 // ---------------------------------------------------------------------------
 // Tests

tests/workspace-config.test.mjs

@@ -28,7 +28,7 @@ const REPO_ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..
 const read = (relPath) => readFileSync(path.join(REPO_ROOT, relPath), 'utf8');
 
 const WORKSPACE_GROUPS = ['apps/*', 'packages/*', 'extensions/*'];
-const WORKSPACE_PACKAGES = ['.', 'apps/server', 'packages/core', 'packages/database-postgres', 'extensions/example'];
+const WORKSPACE_PACKAGES = ['.', 'apps/server', 'packages/core', 'packages/config', 'packages/database-postgres', 'extensions/example'];
 const PINNED_PNPM = '11.23.0';
 
 // ---------------------------------------------------------------------------

tests/workspace-layout.test.mjs

@@ -38,6 +38,7 @@ const TOP_LEVEL_GROUPS = ['apps', 'packages', 'extensions'];
 const EXPECTED_PACKAGES = {
   '@personal-blog/server': 'apps/server',
   '@personal-blog/core': 'packages/core',
+  '@personal-blog/config': 'packages/config',
   '@personal-blog/database-postgres': 'packages/database-postgres',
   '@personal-blog/example-extension': 'extensions/example',
 };