chore(index): repin to the signing key held in this repo's secret

The previous key was pasted into unom/punktfunk's secret store rather than
this one. Gitea secrets don't cross repos and can't be read back, so that
key was unusable here and is abandoned; INDEX_SIGNING_KEY on THIS repo now
holds the private half of the key pinned below.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitea/workflows/publish.yml

@@ -70,7 +70,7 @@ jobs:
       # auditor would use. Catches a key/host mismatch BEFORE it ships, rather
       # than as every host in the field silently rejecting the catalog.
       - name: Verify signature
-        run: bun run verify -- --pub "${{ vars.INDEX_PUBLIC_KEY || 'ed25519:qK18TE2qygIyObtMlHxUI/G1gKby8tPxuieAfnEKgYE=' }}"
+        run: bun run verify -- --pub "${{ vars.INDEX_PUBLIC_KEY || 'ed25519:V7KKMg8sq2A2TW7D/GFWaM0ruAvigpld9r93JdWcQHw=' }}"
 
       - name: Commit signature to main
         run: |

README.md

@@ -230,7 +230,7 @@ PR cannot get anything signed.
 The public key currently pinned in the host:
 
 ```
-ed25519:qK18TE2qygIyObtMlHxUI/G1gKby8tPxuieAfnEKgYE=
+ed25519:V7KKMg8sq2A2TW7D/GFWaM0ruAvigpld9r93JdWcQHw=
 ```
 
 `bun run verify` defaults to this key, so anyone can audit a published index

tools/keys.ts

@@ -22,7 +22,7 @@ export const PUBKEY_PREFIX = "ed25519:";
  * `verify` defaults to this so a signed index can be checked with no arguments.
  */
 export const DEFAULT_PUBLIC_KEY =
-  "ed25519:qK18TE2qygIyObtMlHxUI/G1gKby8tPxuieAfnEKgYE=";
+  "ed25519:V7KKMg8sq2A2TW7D/GFWaM0ruAvigpld9r93JdWcQHw=";
 
 /** Encode a node KeyObject public key as the host's `ed25519:<base64>` form. */
 export function encodePublicKey(key: KeyObject): string {