maude: mark roadmap + extensions complete (254/254, saturated)

Plan: Phase 8 blocked on a 2nd consumer (matching+fire+strategy identified
as extraction candidates); roadmap + 7 extensions done, end-state goal met.

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

plans/maude-on-sx.md

@@ -136,6 +136,27 @@ The novel substrate stress: equational matching. Pattern `X + Y` against `1 + 2
 - [ ] Extract strategy combinators.
 - [ ] Wait for second consumer before extracting.
 
+**Status: BLOCKED — no second consumer yet.** The reusable core is identified:
+`lib/maude/matching.sx` (AC matching + canon) + `lib/maude/fire.sx`
+(short-circuit firing) are the prime extraction candidates; `lib/maude/strategy.sx`
+(combinators) is the third. Keep them separable. Do not extract until a Pure/
+CafeOBJ/term-rewriting playground consumer appears (or artdag-on-sx's effect
+optimiser, per the chisel note).
+
+### SATURATION (post-roadmap)
+
+All 7 roadmap phases + 7 extensions (pretty / run / search-path / owise /
+gather / order-sorted least-sort / search-command + result-sort) DONE, **254/254
+across 13 suites.** The end-state goal — a faithful Maude 3 functional+system
+core that runs idiomatic programs and proves equational identities — is met:
+sorts/subsorts/overloading, equational reduction modulo assoc/comm/id,
+conditional eqs + owise, system rules (rew + BFS search with witness paths),
+a strategy language, and META-LEVEL reflection, with a mixfix surface printer
+and an end-to-end `.maude` runner (reduce/rewrite/search commands, sort-annotated
+output). Pacing down to hardening. Possible niche future work: membership
+axioms (`mb`/`cmb`), critical-pair / confluence checking, meta-search, full
+mixfix (multi-`_` ops, juxtaposition `__`).
+
 ## lib/guest feedback loop
 
 **Consumes:** `core/lex`, `core/pratt`, `core/ast`, `core/match` (with proposed extension for equational matching).