v0.297.0: burn-down round 2 — 24 small rows (R-591 R-568 R-567 R-363 R-547 R-10 R-552 R-251 R-104 R-619 R-362 R-675 R-256 R-257 R-240 R-365 R-425 R-565 R-564 R-603 R-454 R-208 R-457-swept) + the banner countdown and deepCopyStack twins; MinAgent 0.131.0

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/scripts/controller_gates.py

@@ -17,6 +17,7 @@ Gates, in order (all must pass; **non-zero exit on any failure**):
   7. docker-v           every `docker … -v` mount is a named volume or a proven host path
   8. debug-routes       every debug-page control resolves to a handler, and back (R-400)
   9. reuse-refs         every path cited by this repo's REUSE.md still resolves
+  …  gofmt              every Go file is gofmt-clean (R-454)
 
 WHY THIS FILE EXISTS (2026-08-02, closing R-29 leg (a) and half of leg (b)).
 
@@ -93,6 +94,9 @@ GATES = [
     # byte for byte. The template half of parity is proved by rendered fixtures; Go-side copy cannot
     # be, so it is proved structurally here. Fast: stdlib file reads.
     ("go-parity",       os.path.join(SCRIPTS, "i18n_go_parity.py"),            [],       True, True),
+    # R-454 — every Go file is gofmt-clean. `go vet` does not check formatting; nothing did. Fast:
+    # the toolchain's own formatter, no network, no container runtime.
+    ("gofmt",           os.path.join(SCRIPTS, "gofmt_gate.py"),                [],       True, True),
     # R-404 — ADVISORY. Reports the golden debt where it is created; never refuses.
     ("golden-notice", GOLDEN_NOTICE, [REPO], True, False),
 ]