diff --git a/apps/server/src/index.ts b/apps/server/src/index.ts
new file mode 100644
index 0000000..bd4187d
--- /dev/null
+++ b/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 {};
diff --git a/apps/server/tsconfig.json b/apps/server/tsconfig.json
new file mode 100644
index 0000000..5285d28
--- /dev/null
+++ b/apps/server/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "dist"
+  },
+  "include": ["src"]
+}
diff --git a/extensions/example/src/index.ts b/extensions/example/src/index.ts
new file mode 100644
index 0000000..6b5602c
--- /dev/null
+++ b/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 {};
diff --git a/extensions/example/tsconfig.json b/extensions/example/tsconfig.json
new file mode 100644
index 0000000..5285d28
--- /dev/null
+++ b/extensions/example/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "dist"
+  },
+  "include": ["src"]
+}
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
new file mode 100644
index 0000000..e74fa11
--- /dev/null
+++ b/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 {};
diff --git a/packages/core/tsconfig.json b/packages/core/tsconfig.json
new file mode 100644
index 0000000..5285d28
--- /dev/null
+++ b/packages/core/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "dist"
+  },
+  "include": ["src"]
+}
diff --git a/tsconfig.base.json b/tsconfig.base.json
new file mode 100644
index 0000000..4dc62c7
--- /dev/null
+++ b/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
+  }
+}