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

[hyperpolymath]

Summary

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 with their own deno.json.

Per the STEP 6 closure (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 (40 members)

Tree	Members	Notes
affinescript-ecosystem/	3	affinescript-deno-test, rattlescript/affinescript/packages/{affine-js,affine-ts}
aggregate-library	1	Always Deno-native
cadre-router + nested	2	top-level + tea-router-pkg
cadre-tea-router	1	top-level peer
coq-ecosystem/coq-jr	1	Class A migrated
deno-ecosystem/projects/	2	beamdeno, deno-bunbridge (always Deno-native)
rescript-ecosystem/	29	packages/, cadre-router*, cadre-tea-router, idaptik-rescript13-staging*, rescript-{deno-starter,dom-mounter,evangeliser,tea,vite}
v-ecosystem/v-deno	1	V-lang Deno binding

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 13.0.0-alpha.1 vs alpha.3 of the active 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.

Test plan

• CI green (additive only — no existing manifest touched)
• deno task --version recognises the workspace root
• Hypatia :nodejs_detected scan stays quiet (zero package-lock.json in repo)

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).

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