fix(ci): use repository_dispatch for polish release notes (Fission-AI#545)

The GitHub App token doesn't have actions:write permission, which is
required for workflow_dispatch. Switch to repository_dispatch which
works with existing contents:write permission.

Changes:
- release-prepare.yml: Use gh api to trigger repository_dispatch
- polish-release-notes.yml: Add repository_dispatch trigger type
- Delete test workflow (validation complete)

Tested via PR Fission-AI#542 - both workflow_dispatch and repository_dispatch
triggers work correctly with claude-code-action.

Author: TabishB

.github/workflows/polish-release-notes.yml

@@ -3,6 +3,8 @@ name: Polish Release Notes
 # Uses Claude to transform raw changelog into polished release notes.
 # Triggered automatically by release-prepare after publishing, or manually.
 on:
+  repository_dispatch:
+    types: [polish-release-notes]
   workflow_dispatch:
     inputs:
       tag_name:
@@ -11,7 +13,8 @@ on:
         type: string
 
 env:
-  TAG_NAME: ${{ inputs.tag_name }}
+  # repository_dispatch passes tag via client_payload, workflow_dispatch via inputs
+  TAG_NAME: ${{ github.event.client_payload.tag_name || inputs.tag_name }}
 
 permissions:
   contents: write

.github/workflows/release-prepare.yml

@@ -60,6 +60,9 @@ jobs:
           # npm authentication handled via OIDC trusted publishing (no token needed)
 
       # Trigger release notes polishing after a release is published
+      # Uses repository_dispatch instead of workflow_dispatch because:
+      # - workflow_dispatch requires actions:write permission (GitHub App doesn't have it)
+      # - repository_dispatch works with contents:write (which we already have)
       - name: Polish release notes
         if: steps.changesets.outputs.published == 'true'
         env:
@@ -68,4 +71,6 @@ jobs:
           # Get version from package.json (just bumped by changesets)
           TAG="v$(jq -r .version package.json)"
           echo "Triggering polish workflow for $TAG"
-          gh workflow run polish-release-notes.yml -f tag_name="$TAG"
+          gh api repos/${{ github.repository }}/dispatches \
+            --method POST \
+            --input - <<< "{\"event_type\":\"polish-release-notes\",\"client_payload\":{\"tag_name\":\"$TAG\"}}"