feat: add strict tsconfig.base.json shared by all packages (E00-S01-T02)

Adds a strict base TypeScript config at the workspace root (ES2023 / NodeNext
/ strict family incl. noUncheckedIndexedAccess, exactOptionalPropertyTypes,
noImplicitOverride, useUnknownInCatchVariables, verbatimModuleSyntax per
Engineering-Standards) and gives every workspace package
(apps/server, packages/core, extensions/example) a tsconfig.json that extends
it. Each package gets a minimal src/index.ts placeholder so it compiles under
the base config (CJS-safe `export {}` until ESM boundaries land in T03).

Verified: every package typechecks and emits (js + d.ts + sourcemap) with the
pinned TypeScript 6.0.3; a strictness probe confirms the strict family fires.

Closes #155

apps/server/src/index.ts

@@ -0,0 +1,8 @@
+/**
+ * @personal-blog/server — EPPP public server application.
+ *
+ * Bootstrap placeholder so apps/ is a real workspace package that compiles
+ * under tsconfig.base.json. The Fastify 5 application shell (and its real
+ * exports) lands in a later story.
+ */
+export {};

apps/server/tsconfig.json

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

extensions/example/src/index.ts

@@ -0,0 +1,7 @@
+/**
+ * @personal-blog/example-extension — bootstrap placeholder extension.
+ *
+ * Real extensions (e.g. theme-amber) replace this placeholder in later
+ * stories.
+ */
+export {};

extensions/example/tsconfig.json

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

packages/core/src/index.ts

@@ -0,0 +1,7 @@
+/**
+ * @personal-blog/core — EPPP application core.
+ *
+ * Bootstrap placeholder. Later EPPP stories replace this module with the real
+ * application core (site identity, content primitives, extension runtime).
+ */
+export {};

packages/core/tsconfig.json

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

tsconfig.base.json

@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "target": "ES2023",
+    "lib": ["ES2023"],
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "exactOptionalPropertyTypes": true,
+    "noImplicitOverride": true,
+    "useUnknownInCatchVariables": true,
+    "verbatimModuleSyntax": true,
+    "isolatedModules": true,
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "declaration": true,
+    "sourceMap": true,
+    "skipLibCheck": true
+  }
+}