feat(deno): migrate frontier-practices npm → Deno (standards#253)

Class B (npm-wrapper via Deno). Deletes package.json (rescript +
live-server deps). Updates deno.json tasks: rescript via `deno run -A
--node-modules-dir=auto npm:rescript`, live-server via `deno run -A
npm:live-server` (or `jsr:@std/http/file-server` if convenient).

`my-lang/vscode-extension/package.json` is NOT touched — that's a
VSCode extension carve-out (hypatia `/vscode/` prefix).

Refs: standards#253 STEP 3 (smallest-first batch).

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

Author: hyperpolymath

.gitignore

@@ -44,6 +44,12 @@ package-lock.json
 bun.lock
 bun.lockb
 deno.lock
+
+# npm-avoidant (standards#67)
+**/package-lock.json
+yarn.lock
+pnpm-lock.yaml
+.npmrc
 # Built VS Code extension artefact — distributed via GitHub Release, not git
 *.vsix
 _build/

frontier-practices/deno.json

@@ -1,6 +1,16 @@
 {
+  "name": "@hyperpolymath/seven-tentacles",
+  "version": "0.1.0",
+  "description": "Teaching Compiler Architecture to Ages 8-18 Through Progressive Reveal",
+  "license": "AGPL-3.0",
+  "imports": {
+    "live-server": "npm:live-server@^1.2.2",
+    "rescript": "npm:rescript@^12.0.0"
+  },
   "tasks": {
-    "dev": "deno run --watch mod.ts",
+    "build": "deno run -A --node-modules-dir=auto npm:rescript build",
+    "dev": "deno run -A npm:live-server --port=3000 --open=tools/reveal-demo.html",
+    "watch": "deno run --watch mod.ts",
     "test": "deno test",
     "lint": "deno lint",
     "fmt": "deno fmt"