fix(hooks): add PreToolUse pr-workflow guard to settings templates

The gt tap guard pr-workflow command was added in 37f465bde but the
PreToolUse hooks were never added to the embedded settings templates.
This caused polecats to be created without the PR-blocking hooks,
allowing PR #833 to slip through despite the overlays having the hooks.

Adds the pr-workflow guard hooks to both settings-autonomous.json and
settings-interactive.json templates to block:
- gh pr create
- git checkout -b (feature branches)
- git switch -c (feature branches)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/claude/config/settings-interactive.json

@@ -3,6 +3,35 @@
     "beads@beads-marketplace": false
   },
   "hooks": {
+    "PreToolUse": [
+      {
+        "matcher": "Bash(gh pr create*)",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "export PATH=\"$HOME/go/bin:$HOME/.local/bin:$PATH\" && gt tap guard pr-workflow"
+          }
+        ]
+      },
+      {
+        "matcher": "Bash(git checkout -b*)",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "export PATH=\"$HOME/go/bin:$HOME/.local/bin:$PATH\" && gt tap guard pr-workflow"
+          }
+        ]
+      },
+      {
+        "matcher": "Bash(git switch -c*)",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "export PATH=\"$HOME/go/bin:$HOME/.local/bin:$PATH\" && gt tap guard pr-workflow"
+          }
+        ]
+      }
+    ],
     "SessionStart": [
       {
         "matcher": "",