feat(deno): migrate root package.json → deno.json imports (Class B, standards#253 longtail) (#15)

excel-economic-numbers-tool is a ReScript-driven Office add-in
(Excel + LibreOffice). The package.json had `@microsoft/office-js` as
the lone runtime dep + `@rescript/core` + `rescript` as devDeps.

Class B migration:

- Add `npm:rescript@^12.0.0` + `npm:@rescript/core@^1.6.0` +
  `npm:@microsoft/office-js@^1.1.0` to `deno.json` `imports`.
- Replace the broken bare `rescript build` in the `build` task with
  the canonical `deno run -A --node-modules-dir=auto npm:rescript@^12.0.0`
  pattern (the bare form would fail in Deno-only environments — Deno
  doesn't have npx).
- Add `nodeModulesDir: "auto"` for rescript's install lifecycle.
- Delete `package.json` (now redundant — `deno.json` covers all
  runtime + dev deps + scripts).

Office host integration unaffected: `@microsoft/office-js` is loaded
by the Office host from the served manifest, not from the local
`node_modules/`. Deno's `--node-modules-dir=auto` regenerates the
local `node_modules/` at build time for rescript's lifecycle hooks.

Per per-repo follow-up tracker for standards#253 (campaign closed
2026-05-31, longtail tracked in project_estate_npm_to_deno_2026_05_28.md).

Refs hyperpolymath/standards#253.

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

Author: hyperpolymath

deno.json

@@ -5,7 +5,9 @@
   "tasks": {
     "dev": "deno run --watch --allow-net --allow-read --allow-env src/server.ts",
     "start": "deno run --allow-net --allow-read --allow-env src/server.ts",
-    "build": "rescript build && deno bundle src/mod.ts dist/economic-toolkit.js",
+    "rescript:build": "deno run -A --node-modules-dir=auto npm:rescript@^12.0.0 build",
+    "rescript:clean": "deno run -A --node-modules-dir=auto npm:rescript@^12.0.0 clean",
+    "build": "deno task rescript:build && deno bundle src/mod.ts dist/economic-toolkit.js",
     "build:excel": "just build-excel",
     "build:libre": "just build-libre",
     "test": "deno test --allow-net --allow-read --allow-env",
@@ -54,6 +56,10 @@
     "@std/path": "jsr:@std/path@^1.0.0",
     "@std/fs": "jsr:@std/fs@^1.0.0",
     "@std/http": "jsr:@std/http@^1.0.0",
-    "@std/testing": "jsr:@std/testing@^1.0.0"
-  }
+    "@std/testing": "jsr:@std/testing@^1.0.0",
+    "rescript": "npm:rescript@^12.0.0",
+    "@rescript/core": "npm:@rescript/core@^1.6.0",
+    "@microsoft/office-js": "npm:@microsoft/office-js@^1.1.0"
+  },
+  "nodeModulesDir": "auto"
 }