fix(regression): fix relative import (A-reg-1) + consume inbox

- tests/regression/test_canaries.py: replace `from .conftest import ...`
  (relative import fails when not a package) with sys.path + direct import,
  matching the pattern used by all other tests in this repo.
- Delete machine-docs/BUILDER-INBOX.md (Adversary inbox consumed).
- Update STATUS-regression.md + JOURNAL-regression.md with first two
  canary run results (bad-false-green RED confirmed, good-simple GREEN confirmed).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/regression/test_canaries.py

@@ -13,9 +13,17 @@ publishes a new release and the pin is stale (re-run to confirm GREEN before upd
 
 from __future__ import annotations
 
+import os
+import sys
+
 import pytest
 
-from .conftest import run_recipe_ci, stage_has_failing_test, stage_has_passing_test
+sys.path.insert(0, os.path.dirname(__file__))
+import conftest as _reg  # noqa: E402
+
+run_recipe_ci = _reg.run_recipe_ci
+stage_has_passing_test = _reg.stage_has_passing_test
+stage_has_failing_test = _reg.stage_has_failing_test
 
 # ---------------------------------------------------------------------------
 # Canary definitions