iter architect-iron-law.3: JOURNAL entry + close roadmap todo

docs/JOURNAL.md

@@ -13817,3 +13817,46 @@ count may be 406 — verify post-commit), 0 failed.
 closed. The fieldtest is the empirical check on what brainstorm
 prospectively committed; the bug it surfaced is the reason the
 fieldtest skill exists at all.
+
+## 2026-05-10 — Architect iron-law extension: sweep script + lockstep-checklist
+
+`ailang-architect`'s drift-review iron law extended with two
+standing checks, both motivated by failure modes that shipped in
+the closing milestones of the typeclass-and-floats arc:
+
+1. **DESIGN.md history-anchor regrowth.** The four sweep regexes
+   from the design-md-consolidation milestone (history anchors,
+   REVERTED + migration, schema SoT, workflow + stale cross-
+   references) are now packaged as `bench/architect_sweeps.sh` and
+   run as Step 2.5 of the architect's process. Today's DESIGN.md
+   is clean against all four; the script's job is to keep it that
+   way against future commits. Non-zero exit is advisory: the
+   architect reads each match and decides legitimate-quote vs. fresh
+   drift.
+2. **Lockstep invariants across files.** Two cross-file pairings
+   are pinned in the agent's "What you check" section as standing
+   walks: `Pattern::Lit::*` typecheck-rejects ↔
+   `pre_desugar_validation.rs` walkers (the B1 lockstep — the
+   typecheck reject is unreachable through `check_module` if a
+   desugar pass rewrites the shape first), and `lower_app` arms ↔
+   `is_static_callee` recognition (the iter-4.2 / 4.4 lockstep —
+   a direct lowering arm without `is_static_callee` recognition
+   falls through to indirect-call with `UnknownVar`). For each
+   milestone-scope commit-range arm landed in these files, the
+   architect now opens both files in the pair.
+
+Both pairings are real, both shipped silently broken at least once,
+and both were caught only by post-hoc means (B1 by fieldtest, the
+iter-4 ones by mid-iter implementer review). The architect was the
+right role to catch them prospectively; the standing checklist is
+how that role catches them in future.
+
+Per-task commits:
+
+- `67223c8` iter architect-iron-law.1: bench/architect_sweeps.sh runs the four design-md-consolidation sweeps against DESIGN.md
+- `6047b38` iter architect-iron-law.2: extend ailang-architect with sweep-script invocation + lockstep-checklist for two known cross-file pairings
+
+The roadmap entry "Architect-iron-law standing-grep extension"
+under P2 is closed by this iteration. Future lockstep pairings, as
+they surface in JOURNAL entries, can extend the table inline
+without further iteration ceremony.