conformance: exclude forth (foreign Forth corpus via awk+python preprocessing)

forth's conformance.sh reads a foreign Forth test corpus (Hayes Core core.fr),
preprocesses it with awk + an external python3 chunk-splitter that generates a
chunks.sx of raw source strings, then runs them through the interpreter via
(hayes-run-all). The shared driver only epoch-loads SX preloads and evals SX
test suites emitting a counter/dict scoreboard — it cannot reproduce the
external preprocessing pipeline over a foreign .fr corpus (same category as
lua/smalltalk). No SX tests/*.sx suites exist to migrate. Left conformance.sh
untouched; recorded the exclusion.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

plans/agent-briefings/conformance-loop.md

@@ -88,7 +88,7 @@ Blocked with specifics and move to the next candidate next iteration.
 - [x] common-lisp — migrated 487/487 (counters; driver extended for per-suite counters+preloads)
 - [x] erlang — migrated 761/761 (dict; pass/count → :failed = count-pass)
 - [x] feed — migrated 189/189 (counters; test-harness.sx preload for counters+helper)
-- [ ] forth
+- [~] forth — excluded: foreign Forth corpus (Hayes core.fr) via awk+python preprocessing
 - [ ] go
 - [ ] js
 - [ ] ocaml
@@ -100,6 +100,14 @@ Blocked with specifics and move to the next candidate next iteration.
 
 ## Progress log (newest first)
 
+- 2026-06-07 — forth: EXCLUDED (foreign-runner, like lua/smalltalk). Its conformance.sh
+  reads a foreign Forth corpus (lib/forth/ans-tests/core.fr, the gerryjackson Hayes Core
+  suite), preprocesses it with awk (strip `\` / `( )` comments + TESTING lines), splits it
+  into `}T` chunks via an external python3 script that generates a chunks.sx of raw source
+  strings, then runs them through the interpreter via (hayes-run-all) → {:pass :fail :error
+  :total}. The shared driver only epoch-loads SX preloads + evals SX test suites; it can't
+  reproduce the awk+python preprocessing of a foreign .fr corpus. No SX `tests/*.sx` suites
+  exist to point the driver at. Left conformance.sh untouched. Not migrated.
 - 2026-06-07 — feed: migrated to `MODE=counters`, 189/189 exact parity (basic 30,
   fanout 29, rank 24, integration 22, content 15, notify 8, home 6, dedupe 9, trending 11,
   mute 9, page 14, thread 12). Canonical counters shape: fresh session per suite, shared