docs(quandledb): add CRG v2 READINESS.md (grade D)

Honest component readiness assessment per CRG v2.0 STRICT standard.
Polyglot project (Julia/Idris2/Zig/V/Elixir) with partial RSR compliance.
Blocks to C documented: missing EXPLAINME, TEST-NEEDS, full-stack dogfood.

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

Author: hyperpolymath

quandledb/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 — QuandleDB
+
+**Current Grade:** D
+**Assessed:** 2026-04-05
+**Standard:** [CRG v2.0 STRICT](../../standards/component-readiness-grades/)
+
+## Grade rationale (evidence for D)
+
+Works on some things + partial RSR compliance. QuandleDB is a polyglot project:
+Julia HTTP server (Skein.jl wrapper) + Julia semantic sidecar + Idris2 ABI +
+Zig FFI + V-lang API + Elixir BEAM NIFs.
+
+### Evidence
+
+- **Tests:** 21 passing (9 quandle extraction + 12 semantic index integration)
+- **Components present:**
+  - `server/serve.jl` — HTTP server with quandle_semantic_index SQLite sidecar
+  - `server/quandle_semantic.jl` — QuandleSemantic module (presentation extraction + hashing)
+  - `src/abi/Types.idr` — Idris2 ABI type layer
+  - `src/ffi/semantic_ffi.zig` — Zig FFI layer
+  - `src/api/*.v` — V-lang API triples
+  - `beam/` — Elixir BEAM client with NIFs
+- **RSR compliance:** Partial. Has 5 per-directory READMEs. 0-AI-MANIFEST.a2ml
+  present (template). `.machine_readable/6a2/` directory exists.
+- **CI:** panic-attack assail 0 findings.
+
+## Gaps preventing higher grades
+
+### Blocks C (works reliably + annotated)
+- No EXPLAINME.adoc, TEST-NEEDS.md, PROOF-NEEDS.md at repo root.
+- Julia server code has no docstrings.
+- Elixir BEAM layer has no dedicated test coverage documented here.
+- No integration tests spanning the full Idris2 → Zig → V → Julia → Elixir stack.
+- No dogfooding evidence — has anyone actually driven this end-to-end?
+- Only 4 commits in history before absorption into nextgen-databases monorepo.
+
+### Blocks B
+- Requires C first.
+
+## What to do for C
+
+1. Add EXPLAINME.adoc explaining the polyglot architecture and its intended
+   users.
+2. Add TEST-NEEDS.md documenting what's tested at each language layer and what isn't.
+3. Write docstrings for `server/serve.jl`, `server/quandle_semantic.jl`.
+4. Add per-language READMEs at `src/abi/`, `src/ffi/`, `src/api/`, `beam/`
+   explaining what each layer contributes.
+5. Demonstrate a full-stack dogfood: invoke Idris2 ABI-verified call, through
+   Zig FFI, via V-lang API, hitting Julia server, surfacing via BEAM NIF, and
+   have a real test assert on it.
+
+## Review cycle
+
+Reassess after the full-stack dogfood test exists.