Auto-commit: Sync changes [2026-03-02]

Author: hyperpolymath

URGENT-RESCRIPT-MIGRATION.md

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+# URGENT: ReScript Migration Required
+
+**Generated:** 2026-03-02
+**Current stable ReScript:** 12.2.0
+**Pre-release:** 13.0.0-alpha.2 (2025-02-27)
+
+This repo has ReScript code that needs migration. Address in priority order.
+
+## CHECK: Version Unknown or Unpinned
+
+- `impl/mcp (no version pinned)`
+
+**Action:** Pin to `"rescript": "^12.2.0"` explicitly.
+
+---
+
+## ReScript 13 Preparation (v13.0.0-alpha.2 available)
+
+v13 is in alpha. These breaking changes are CONFIRMED — prepare now:
+
+1. **`bsconfig.json` support removed** — must use `rescript.json` only
+2. **`rescript-legacy` command removed** — only modern build system
+3. **`bs-dependencies`/`bs-dev-dependencies`/`bsc-flags` config keys removed**
+4. **Uncurried `(. args) => ...` syntax removed** — use standard `(args) => ...`
+5. **`es6`/`es6-global` module format names removed** — use `esmodule`
+6. **`external-stdlib` config option removed**
+7. **`--dev`, `--create-sourcedirs`, `build -w` CLI flags removed**
+8. **`Int.fromString`/`Float.fromString` API changes** — no explicit radix arg
+9. **`js-post-build` behaviour changed** — now passes correct output paths
+
+**Migration path:** Complete all v12 migration FIRST, then test against v13-alpha.