docs: add CRG v2 READINESS.md (grade C)

Honest component readiness assessment per CRG v2.0 STRICT standard.
Evidence, gaps, and path to next grade documented.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

READINESS.md

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+<!-- SPDX-License-Identifier: PMPL-1.0-or-later -->
+<!-- Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk> -->
+
+# Component Readiness — Tangle (language)
+
+**Current Grade:** C
+**Assessed:** 2026-04-05
+**Standard:** [CRG v2.0 STRICT](../standards/component-readiness-grades/)
+
+## Grade rationale (evidence for C)
+
+Works reliably on own project + annotated. Tangle is a Turing-complete
+topological programming language with a compiler, LSP, and wasm backend.
+
+### Evidence
+
+- **Tests:** 6 dune test suites (parser, typecheck, eval, e2e, property, compositional)
+- **Annotation:** 8 per-directory READMEs across compiler/, lib/, examples/, docs/
+- **Dogfooding:** Used internally as host for the KRL (Knot Resolution Language) DSL
+- **RSR compliance:** 0-AI-MANIFEST.a2ml, `.machine_readable/6a2/`, 14+ workflows, SECURITY/CONTRIBUTING/CODE_OF_CONDUCT, EXPLAINME.adoc, TEST-NEEDS.md, PROOF-NEEDS.md
+- **Formal proofs:** Lean 4 proofs for progress, preservation, determinism
+- **WASM backend:** Compositional PD compiler with wasm codegen
+- **CI:** Clean; panic-attack assail 0 findings
+
+## Gaps preventing higher grades
+
+### Blocks B (6+ diverse external targets)
+- No external language users outside hyperpolymath.
+- KRL is the only DSL built on Tangle so far — need 5 more distinct domain DSLs
+  to demonstrate the host-language claim.
+- No external submissions to language research venues confirming the phase
+  separation or compositional PD model.
+
+### Blocks A
+- Requires B first.
+
+## What to do for B
+
+1. Build 5 more DSLs on top of Tangle (not just KRL) — e.g. a braid-group
+   calculus, a category-theory calculus, a quantum-circuit calculus.
+2. Get external feedback on the surface syntax and compiler from language
+   researchers.
+3. Track the 6 targets here.
+
+## Review cycle
+
+Reassess per release. Next review: on any compiler/LSP/wasm behavioural change.