feat(deno): migrate odds-and-sods-package-manager npm → Deno (standards#253) (#42)

Class A (pure-Deno port). Deletes redundant package.json — deno.json
already covers all tooling (rescript build/watch/clean via npm: specifier,
test/lint/fmt/check via deno) and imports map covers all deps.

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

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

Author: hyperpolymath

.gitignore

@@ -108,3 +108,10 @@ deps/
 .cache/
 build/
 dist/
+
+# npm/yarn/pnpm/bun lockfiles (Deno-only project; standards#253)
+package-lock.json
+bun.lockb
+yarn.lock
+pnpm-lock.yaml
+.npmrc