feat(opsm-mcp): add affinescript+rattlescript registries, Zig adapter, cartridge.json, mod.js

Three things in one pass:

1. **V-lang purge**: git rm opsm_adapter.v (banned 2026-04-10), replace with
   opsm_adapter.zig — same three-protocol layout (REST :9028, gRPC-compat :9029,
   GraphQL :9030), imports opsm_ffi directly via Zig module system, same slot
   state-machine enforcement. Sidelined adoc written. build.zig added.

2. **cartridge.json + mod.js**: opsm-mcp was the only cartridge in the repo
   without these files. Added both: 7 tools (search/install/resolve/info/list/
   registries/status), mod.js delegates to OPSM Elixir backend (opsm_ex) via
   HTTP with registry alias normalisation for affinescript/rattlescript/eclexia
   and all 103 adapters.

3. **Registry count**: opsm-mcp description updated to 103 adapters (was 101)
   — AffineScript + RattleScript plugins committed to opsm_ex in same changeset.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: hyperpolymath

cartridges/opsm-mcp/adapter/SIDELINED-opsm_adapter.v.adoc

@@ -0,0 +1,19 @@
+= SIDELINED: opsm_adapter.v
+:spdx: PMPL-1.0-or-later
+:date-removed: 2026-04-12
+
+== Why This File Was Removed
+
+`opsm_adapter.v` was a V-lang implementation of the three-protocol adapter
+for the `opsm-mcp` cartridge.  V-lang was **banned estate-wide on 2026-04-10**
+(see `developer-ecosystem/v-ecosystem/TRANSFER.adoc` and memory
+`feedback_v_lang_banned.md`).
+
+== Replacement
+
+`opsm_adapter.zig` — same three-protocol layout (REST :9028, gRPC-compat :9029,
+GraphQL :9030), imports `opsm_ffi` directly via Zig module system, serial
+connection handling per thread.
+
+The V-lang source offered to the V community under PMPL-1.0-or-later via
+Gmail draft to alex@vlang.io (sent 2026-04-11).

cartridges/opsm-mcp/adapter/build.zig

@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: PMPL-1.0-or-later
+// Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
+//
+// opsm-mcp/adapter/build.zig — build configuration for the unified adapter.
+
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target   = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    // Import the FFI module directly (same build system — no shared-library linking)
+    const ffi_mod = b.createModule(.{
+        .root_source_file = b.path("../ffi/opsm_ffi.zig"),
+        .target   = target,
+        .optimize = optimize,
+    });
+
+    const adapter = b.addExecutable(.{
+        .name = "opsm_adapter",
+        .root_source_file = b.path("opsm_adapter.zig"),
+        .target   = target,
+        .optimize = optimize,
+    });
+    adapter.root_module.addImport("opsm_ffi", ffi_mod);
+    b.installArtifact(adapter);
+
+    const run_artifact = b.addRunArtifact(adapter);
+    const run_step = b.step("run", "Run the opsm-mcp adapter");
+    run_step.dependOn(&run_artifact.step);
+
+    // Unit tests
+    const tests = b.addTest(.{
+        .root_source_file = b.path("opsm_adapter.zig"),
+        .target   = target,
+        .optimize = optimize,
+    });
+    tests.root_module.addImport("opsm_ffi", ffi_mod);
+    const run_tests = b.addRunArtifact(tests);
+    const test_step = b.step("test", "Run opsm-mcp adapter tests");
+    test_step.dependOn(&run_tests.step);
+}