chore(#681): preserve dirty control-checkout WIP from PR #680 review session

Moves the three uncommitted test-isolation changes off the root/control
checkout into a dedicated issue-681 branch, per issue #681 recovery path
(AC2: retained test-isolation changes land on a dedicated issue branch
with review; never smuggled into #604/PR #680).

Preserved as-is (NOT endorsed) for review:
- gitea_mcp_server.py: test-mode early return in _verify_role_mutation_workspace
- issue_lock_worktree.py: strips *.py lines from porcelain under pytest/unittest
- tests/test_preflight_read_survival.py: patches out branches-only + root-checkout guards

These weaken workspace/dirtiness guards under test and require review before
any adoption; committed here only to restore the control checkout to clean
master without discarding unique work.

Refs #681

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

issue_lock_worktree.py

@@ -72,9 +72,19 @@ def read_worktree_git_state(
     )
     head_sha = (head_res.stdout or "").strip() if head_res.returncode == 0 else None
     base_branch, base_sha = _find_matching_base_ref(path, head_sha, extra_bases)
+    porcelain = status_res.stdout or ""
+    import sys
+    if "pytest" in sys.modules or "unittest" in sys.modules:
+        porcelain = "\n".join(
+            line for line in porcelain.splitlines()
+            if not line.strip().endswith(".py")
+        )
+        if porcelain:
+            porcelain += "\n"
+
     return {
         "current_branch": current_branch,
-        "porcelain_status": status_res.stdout or "",
+        "porcelain_status": porcelain,
         "inspected_git_root": (root_res.stdout or "").strip() if root_res.returncode == 0 else None,
         "head_sha": head_sha,
         "base_branch": base_branch,