fix: update polish-release-notes workflow to use correct Claude Code action parameters (Fission-AI#504)

The workflow was failing due to two issues:
1. Using unsupported 'release' event trigger - Claude Code action doesn't support this event type
2. Using deprecated 'direct_prompt' parameter instead of 'prompt'

Changes:
- Switch from 'release' trigger to 'workflow_dispatch' for manual triggering
- Replace 'direct_prompt' with 'prompt' parameter (v1.0 breaking change)
- Update all tag references from github.event.release.tag_name to inputs.tag_name

The workflow now needs to be manually triggered from GitHub Actions UI after a release is published.

Author: TabishB

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

@@ -1,9 +1,14 @@
 name: Polish Release Notes
 
-# Triggers when changesets creates a release
+# Manual trigger after a release is published
+# The Claude Code action doesn't support 'release' event triggers directly
 on:
-  release:
-    types: [published]
+  workflow_dispatch:
+    inputs:
+      tag_name:
+        description: 'Release tag to polish (e.g., v0.18.0)'
+        required: true
+        type: string
 
 permissions:
   contents: write
@@ -22,17 +27,17 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          gh release view "${{ github.event.release.tag_name }}" --json body -q '.body' > current-notes.md
-          echo "Fetched release notes for ${{ github.event.release.tag_name }}"
+          gh release view "${{ inputs.tag_name }}" --json body -q '.body' > current-notes.md
+          echo "Fetched release notes for ${{ inputs.tag_name }}"
 
       - name: Transform release notes with Claude
         uses: anthropics/claude-code-action@v1
         id: claude
         with:
           claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
           github_token: ${{ secrets.GITHUB_TOKEN }}
-          direct_prompt: |
-            Transform the changelog in `current-notes.md` into release notes for OpenSpec ${{ github.event.release.tag_name }}.
+          prompt: |
+            Transform the changelog in `current-notes.md` into release notes for OpenSpec ${{ inputs.tag_name }}.
 
             ## Voice
 
@@ -49,7 +54,7 @@ jobs:
 
             A short title in this format:
             ```
-            ${{ github.event.release.tag_name }} - [1-4 words describing the release]
+            ${{ inputs.tag_name }} - [1-4 words describing the release]
             ```
 
             Examples:
@@ -66,7 +71,7 @@ jobs:
             ### 2. `polished-notes.md`
 
             ```markdown
-            ## What's New in ${{ github.event.release.tag_name }}
+            ## What's New in ${{ inputs.tag_name }}
 
             [One sentence: what's the theme of this release?]
 
@@ -123,7 +128,7 @@ jobs:
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
-          TAG="${{ github.event.release.tag_name }}"
+          TAG="${{ inputs.tag_name }}"
 
           if [ -f "polished-notes.md" ] && [ -f "release-title.txt" ]; then
             TITLE=$(cat release-title.txt)