fix(workflows): pass prompt via action 'prompt:' input not --prompt-file

The anthropics/claude-code-action@v1 action does not honor
--prompt-file in claude_args; without the 'prompt:' input it
auto-detects mode but skips with 'No trigger found'. Read each
prompt file in a preceding step into a step output and pass via
the prompt: input. Validates the new pattern on pr-review.yml
first; the other 5 Claude-using workflows get the same treatment
in a follow-up commit.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Claude (Initial Force WPF Bot)

.github/workflows/pr-review.yml

@@ -93,13 +93,24 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Load pr-review-1 prompt
+        id: load-prompt-1
+        shell: bash
+        run: |
+          {
+            echo 'prompt<<__EOF_PROMPT__'
+            cat .if-fork/prompts/pr-review-1.md
+            echo
+            echo '__EOF_PROMPT__'
+          } >> "$GITHUB_OUTPUT"
+
       - name: Run review-1 (Claude Opus — prompt pr-review-1.md)
         id: review
         uses: anthropics/claude-code-action@v1
         with:
           anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+          prompt: ${{ steps.load-prompt-1.outputs.prompt }}
           claude_args: >-
-            --prompt-file .if-fork/prompts/pr-review-1.md
             --max-turns 12
             --model claude-opus-4-7
             --allowedTools Bash,Read,Grep,mcp__github__pull_request_read,mcp__github__get_file_contents
@@ -171,13 +182,24 @@ jobs:
         with:
           python-version: "3.12"
 
+      - name: Load pr-review-2 prompt
+        id: load-prompt-2
+        shell: bash
+        run: |
+          {
+            echo 'prompt<<__EOF_PROMPT__'
+            cat .if-fork/prompts/pr-review-2.md
+            echo
+            echo '__EOF_PROMPT__'
+          } >> "$GITHUB_OUTPUT"
+
       - name: Run review-2 (Claude Opus — prompt pr-review-2.md, different from review-1)
         id: review
         uses: anthropics/claude-code-action@v1
         with:
           anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+          prompt: ${{ steps.load-prompt-2.outputs.prompt }}
           claude_args: >-
-            --prompt-file .if-fork/prompts/pr-review-2.md
             --max-turns 12
             --model claude-opus-4-7
             --allowedTools Bash,Read,Grep,mcp__github__pull_request_read,mcp__github__get_file_contents