chore(gitignore): adopt #67/#68 canonical entries, untrack ui/package-lock.json

Adds the canonical `.gitignore` blocks from rsr-template-repo /
v3-templater and removes `ui/package-lock.json` from tracking
(file remains on disk locally).

Existing tracked `.editorconfig` is left in place per standards#68's
owner ruling that removing tracked copies is a separate per-repo
chore.

Refs hyperpolymath/standards#66
Refs hyperpolymath/standards#67
Refs hyperpolymath/standards#68

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

Author: hyperpolymath

.gitignore

@@ -148,3 +148,14 @@ htmlcov/
 *.bak
 # asdf version manager
 .tool-versions
+
+# npm-avoidant (standards#67): estate JS-runtime policy is Deno>Bun>pnpm>npm.
+# npm lockfiles must never be committed estate-wide.
+package-lock.json
+**/package-lock.json
+
+# Agent & editor scaffolding (standards#68) — local-only, never committed
+# estate-wide. Owner decision 2026-05-16: gitignore both rather than commit
+# per-repo agent/editor config.
+.editorconfig
+.claude/