WP-0016 finished: interactive registry maintain with llm-connect automation

Closes the registry maintenance loop from inside each domain repo:
interactive prompting for judgment calls, full automation for safe and
high-confidence changes, both backed by the llm-connect HTTP bridge.

- New modules: maintain.py, maintain_llm.py, patches.py, interactive.py
- Schema: schemas/registry-patch.schema.json
- CLI: reuse-surface maintain; establish --scaffold --hook
- Sibling templates: Makefile fragment, pre-commit hook
- Deterministic signal collectors extended; validate cwd auto-detect
- Docs, gap priority 28, SCOPE update
- Tests: test_maintain.py, test_interactive.py (59 pytest total)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_interactive.py

@@ -0,0 +1,45 @@
+from __future__ import annotations
+
+import pytest
+
+from reuse_surface.interactive import NonInteractiveError, format_patch_summary, prompt_batch
+
+
+def test_format_patch_summary():
+    text = format_patch_summary(
+        {
+            "capability_id": "capability.demo.sample",
+            "kind": "vector_sync",
+            "confidence": "high",
+            "rationale": "drift",
+            "value": "D2 / A0 / C0 / R0",
+        }
+    )
+    assert "vector_sync" in text
+
+
+def test_prompt_batch_non_tty_raises():
+    with pytest.raises(NonInteractiveError):
+        prompt_batch(
+            [
+                {
+                    "capability_id": "capability.demo.sample",
+                    "kind": "vector_sync",
+                    "confidence": "high",
+                    "rationale": "drift",
+                    "value": "D2 / A0 / C0 / R0",
+                }
+            ]
+        )
+
+
+def test_prompt_batch_assume_yes():
+    patch = {
+        "capability_id": "capability.demo.sample",
+        "kind": "vector_sync",
+        "confidence": "high",
+        "rationale": "drift",
+        "value": "D2 / A0 / C0 / R0",
+    }
+    selected = prompt_batch([patch], assume_yes=True)
+    assert selected == [patch]