chore(release): regen ir/manifest + INDEX for v0.4.0 designVersion

make release bumps package.json but not the IR; regenerate so the manifest
version anchor (and INDEX header) read 0.4.0 to match the published package.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

ir/INDEX.md

@@ -1,7 +1,7 @@
 <!-- GENERATED by scripts/ir-extract.mjs (make ir) — do not hand-edit. -->
 # whynot-design IR catalog
 
-**designVersion** `0.3.0` · **components** 10 · **generated** 2026-06-27T17:28:08.913Z
+**designVersion** `0.4.0` · **components** 10 · **generated** 2026-06-28T22:41:24.992Z
 
 Machine-readable companion: [`manifest.json`](./manifest.json) (per-component + token hashes).
 

ir/manifest.json

@@ -1,7 +1,7 @@
 {
   "schemaVersion": "1.0.0",
-  "designVersion": "0.3.0",
-  "generatedAt": "2026-06-27T17:28:08.913Z",
+  "designVersion": "0.4.0",
+  "generatedAt": "2026-06-28T22:41:24.992Z",
   "tokensHash": "sha256:426f565a9ce6c36f",
   "components": [
     {