feat(deno): workspace finalisation — root deno.json with 40-member workspace field (STEP 7 closeout)

Completes the STEP 7 workspace finalisation acceptance criterion (1) for
developer-ecosystem from hyperpolymath/standards#275: add `deno.json` at
repo root with `workspace` array listing all 40 sub-projects that have
their own `deno.json`.

This was the missing acceptance gate. Per the STEP 6 closure comment on
hyperpolymath/standards#273, the per-sub-project migrations were already
landed via the cross-cutting workflow-modernisation + tooling sweeps over
April-May 2026 (19 of 23 in-scope manifests paired with deno.json; the
remaining 4 are dependency-shim Class C npm-publishable consumer artifacts
where Deno-native exposure isn't a priority). The workspace-root
coordination is the closeout task per STEP 7's body.

## Workspace member breakdown

- `affinescript-ecosystem/` (3 members)
- `aggregate-library` (1)
- `cadre-router` + nested `tea-router-pkg` (2)
- `cadre-tea-router` (1)
- `coq-ecosystem/coq-jr` (1)
- `deno-ecosystem/projects/` (2)
- `rescript-ecosystem/` (29 across packages/, cadre-router, cadre-tea-router, idaptik, rescript-*)
- `v-ecosystem/v-deno` (1)

Top-level tasks `build-all`/`test-all`/`fmt`/`lint` delegate to per-member
tasks via `deno task --recursive`.

## What is intentionally NOT included

- `rescript-ecosystem/rescript/**` — upstream-fork carve-out (22 manifests)
  covered by hypatia `:nodejs_detected` `rescript/` path_allow_prefix
- `rescript-ecosystem/packages/core/compiler-source/**` — vendored upstream
  rescript snapshot (45 manifests, separate version line from the active
  `rescript/` fork)
- `affinescript-ecosystem/.../editors/{vscode,tree-sitter-affinescript}/**`
  — VSCode + tree-sitter Class C carve-outs
- 4 dependency-shim Class C npm-publishable manifests
  (`affinescript-vite`, `rescript-grpc-runtime`, `rescript-string-power`,
  `rescript-vite-config`) — declared in STEP 6 closure as residual

After this PR merges, developer-ecosystem satisfies acceptance criterion (1)
of hyperpolymath/standards#275; the remaining residuals are out-of-scope
per the umbrella body's `Out of scope` carry-forward.

Refs hyperpolymath/standards#275 (this completes the developer-ecosystem portion)
Refs hyperpolymath/standards#253 (umbrella npm → Deno migration)
Refs hyperpolymath/standards#273 (STEP 6 closeout — substantially-done declaration)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

deno.json

@@ -0,0 +1,59 @@
+{
+  "$schema": "https://deno.land/x/deno/cli/schemas/config-file.v1.json",
+  "name": "@hyperpolymath/developer-ecosystem",
+  "version": "0.1.0",
+  "license": "MPL-2.0",
+  "workspace": [
+    "./affinescript-ecosystem/affinescript-deno-test",
+    "./affinescript-ecosystem/rattlescript/affinescript/packages/affine-js",
+    "./affinescript-ecosystem/rattlescript/affinescript/packages/affine-ts",
+    "./aggregate-library",
+    "./cadre-router",
+    "./cadre-router/tea-router-pkg",
+    "./cadre-tea-router",
+    "./coq-ecosystem/coq-jr",
+    "./deno-ecosystem/projects/beamdeno",
+    "./deno-ecosystem/projects/deno-bunbridge",
+    "./rescript-ecosystem/cadre-router",
+    "./rescript-ecosystem/cadre-router/tea-router",
+    "./rescript-ecosystem/cadre-router/tea-router-pkg",
+    "./rescript-ecosystem/cadre-tea-router",
+    "./rescript-ecosystem/idaptik-rescript13-staging",
+    "./rescript-ecosystem/idaptik-rescript13-staging/idaptik-ums",
+    "./rescript-ecosystem/packages/bindings/d3",
+    "./rescript-ecosystem/packages/bindings/gossamer",
+    "./rescript-ecosystem/packages/bindings/redis",
+    "./rescript-ecosystem/packages/bindings/tauri",
+    "./rescript-ecosystem/packages/core/env",
+    "./rescript-ecosystem/packages/core/poly-core",
+    "./rescript-ecosystem/packages/core/runtime-tools",
+    "./rescript-ecosystem/packages/ffi/alib",
+    "./rescript-ecosystem/packages/ffi/wasm-runtime",
+    "./rescript-ecosystem/packages/ffi/zig-ffi",
+    "./rescript-ecosystem/packages/tooling/create-poly",
+    "./rescript-ecosystem/packages/tooling/evangeliser",
+    "./rescript-ecosystem/packages/tooling/greasy-rescripter",
+    "./rescript-ecosystem/packages/web/bridge-web",
+    "./rescript-ecosystem/packages/web/dom-mounter",
+    "./rescript-ecosystem/packages/web/http-server",
+    "./rescript-ecosystem/packages/web/tea",
+    "./rescript-ecosystem/packages/web/websocket",
+    "./rescript-ecosystem/rescript-deno-starter",
+    "./rescript-ecosystem/rescript-dom-mounter",
+    "./rescript-ecosystem/rescript-evangeliser",
+    "./rescript-ecosystem/rescript-tea",
+    "./rescript-ecosystem/rescript-vite",
+    "./v-ecosystem/v-deno"
+  ],
+  "tasks": {
+    "build-all": "deno task --recursive build",
+    "test-all": "deno task --recursive test",
+    "fmt": "deno fmt",
+    "lint": "deno lint"
+  },
+  "fmt": {
+    "useTabs": false,
+    "lineWidth": 100,
+    "indentWidth": 2
+  }
+}