feat(deno): migrate recon-silly-ation npm → Deno (standards#253) (#88)

## Summary

Class B (npm-wrapper via Deno) migration of `recon-silly-ation/`
sub-tree.

- Delete `recon-silly-ation/package.json` (stub: `private:true`, devDeps
only = `rescript@11.1.4` + `@rescript/core@1.6.1`, scripts
`build`/`clean` for the ReScript compiler).
- Delete `recon-silly-ation/pnpm-lock.yaml` (lockfile artifact).
- Append npm-avoidant block to root `.gitignore` (standards#67).

`recon-silly-ation/deno.json` already carries Deno-native tasks only (no
bare `rescript` invocations), so no task rewrites required. If ReScript
compilation is needed later, it can be re-introduced via `deno run -A
--node-modules-dir=auto npm:rescript` per recipe.

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

## Test plan

- [ ] CI green on PR
- [ ] No `package.json` / `pnpm-lock.yaml` remain under
`recon-silly-ation/`
- [ ] Root `.gitignore` contains npm-avoidant block

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

Author: hyperpolymath

.gitignore

@@ -86,3 +86,11 @@ generated/tlaiser/
 generated/wokelangiser/
 generated/alloyiser/
 generated/abi/
+
+# npm-avoidant (standards#67)
+package-lock.json
+**/package-lock.json
+bun.lockb
+yarn.lock
+pnpm-lock.yaml
+.npmrc