Codifies that Tier-1 (local pytest + Docker) is necessary but NOT
sufficient: Tier-2 (Jetson Orin Nano via run-tests-jetson.sh) is the
product-completeness gate for runtime_root, c7_inference, c3_matcher,
c2_5_rerank, replay_input, and the replay CLI. Documents the
mandatory-Tier-2 scope, what Tier-1-only stubs cannot prove, the
operating procedure, and what batch reports must capture for in-scope
changes. Surfaced by the Step-11 cycle-1 finding that AZ-618 was only
caught because Tier-2 was actually run.
Co-authored-by: Cursor <cursoragent@cursor.com>