fix(lsp-mcp): replace banned V-lang adapter with Zig unified adapter

V-lang was banned from the hyperpolymath estate 2026-04-10.
lsp_adapter.v is removed; lsp_adapter.zig + build.zig replace it.

The new adapter provides identical REST/gRPC-compat/GraphQL endpoints:
  REST        port 9016  HTTP/1.1 + JSON
  gRPC-compat port 9017  HTTP/1.1 transcoding with proto-style paths
  GraphQL     port 9018  POST /graphql keyword dispatch + SDL at /graphql/schema

Imports lsp_ffi.zig directly via Zig module system — no shared-library
linking required. All FFI session state machine calls preserved.

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

Author: hyperpolymath

cartridges/lsp-mcp/adapter/SIDELINED-lsp_adapter.v.adoc

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: PMPL-1.0-or-later
+= SIDELINED: lsp_adapter.v
+
+`lsp_adapter.v` has been sidelined.
+
+*Reason:* V-lang was banned from the hyperpolymath estate on 2026-04-10.
+Detection: `v.mod` / `vpkg.json` (`.v` extension not used — Verilog collision).
+
+*Replacement:* `lsp_adapter.zig` + `build.zig` in this same directory.
+The Zig adapter provides identical REST/gRPC-compat/GraphQL endpoints
+on ports 9016/9017/9018 and imports the `lsp_ffi` module directly.
+
+*Action required:* `git rm adapter/lsp_adapter.v` from the lsp-mcp cartridge root.

cartridges/lsp-mcp/adapter/build.zig

@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: PMPL-1.0-or-later
+// Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
+//
+// LSP-MCP Cartridge — adapter build configuration (Zig 0.14+).
+//
+// Builds the `lsp-adapter` binary: the unified REST/gRPC-compat/GraphQL server
+// that wraps the lsp_ffi.zig session state machine.
+//
+// Usage:
+//   zig build         -- build lsp-adapter binary
+//   zig build run     -- build and run (REST :9016, gRPC-compat :9017, GraphQL :9018)
+//   zig build test    -- run unit tests
+
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target   = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    // ── lsp_ffi module (state machine from sibling directory) ──────────────
+    // Imported directly by the adapter — no shared-library linking needed.
+    const ffi_mod = b.createModule(.{
+        .root_source_file = b.path("../ffi/lsp_ffi.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    // ── lsp-adapter executable ─────────────────────────────────────────────
+    const adapter = b.addExecutable(.{
+        .name = "lsp-adapter",
+        .root_source_file = b.path("lsp_adapter.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+    adapter.root_module.addImport("lsp_ffi", ffi_mod);
+    b.installArtifact(adapter);
+
+    // ── run step ───────────────────────────────────────────────────────────
+    const run_cmd  = b.addRunArtifact(adapter);
+    const run_step = b.step("run", "Run lsp-adapter (REST :9016, gRPC :9017, GraphQL :9018)");
+    run_step.dependOn(&run_cmd.step);
+
+    // ── tests ──────────────────────────────────────────────────────────────
+    const tests = b.addTest(.{
+        .root_source_file = b.path("lsp_adapter.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+    tests.root_module.addImport("lsp_ffi", ffi_mod);
+
+    const run_tests  = b.addRunArtifact(tests);
+    const test_step  = b.step("test", "Run adapter unit tests");
+    test_step.dependOn(&run_tests.step);
+}