feat(deno): migrate rescript_modules npm → Deno (standards#253 STEP 3) (#29)

## Summary

Class B migration of `rescript_modules/` from npm → Deno. Authors a
fresh `deno.json` (none existed) that wraps the rescript toolchain via
`deno run -A --node-modules-dir=auto npm:rescript@^11.0.0 <args>` —
preserves the package.json's pinned version.

- Adds `rescript_modules/deno.json` with build/clean/watch tasks +
imports map (`rescript`, `@rescript/core`)
- Deletes redundant `rescript_modules/package.json` stub
- Appends standards#67 npm-avoidant patterns to root `.gitignore`

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

## Test plan

- [ ] `deno task build` resolves npm:rescript@^11.0.0 and compiles
`src/` under `rescript_modules/`
- [ ] `deno task clean` removes generated artefacts
- [ ] `deno task watch` runs incremental build

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: hyperpolymath

.gitignore

@@ -85,3 +85,11 @@ deps/
 .cache/
 build/
 dist/
+
+# npm-avoidant (standards#67)
+package-lock.json
+**/package-lock.json
+bun.lockb
+yarn.lock
+pnpm-lock.yaml
+.npmrc

rescript_modules/deno.json

@@ -0,0 +1,15 @@
+{
+  "$schema": "https://deno.land/x/deno/cli/schemas/config-file.v1.json",
+  "name": "@hyperpolymath/safe-brute-force-rescript",
+  "version": "0.1.0",
+  "tasks": {
+    "build": "deno run -A --node-modules-dir=auto npm:rescript@^11.0.0 build",
+    "clean": "deno run -A --node-modules-dir=auto npm:rescript@^11.0.0 clean",
+    "watch": "deno run -A --node-modules-dir=auto npm:rescript@^11.0.0 build -w"
+  },
+  "imports": {
+    "rescript": "npm:rescript@^11.0.0",
+    "@rescript/core": "npm:@rescript/core@^1.0.0"
+  },
+  "nodeModulesDir": "auto"
+}