Add GitHub community files

- FUNDING.yml for sponsorship
- Issue templates (bug, feature, docs, question)
- dependabot.yml (if not present)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Jonathan D.A. Jewell

.github/FUNDING.yml

@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# Funding platforms for hyperpolymath projects
+# See: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/displaying-a-sponsor-button-in-your-repository
+
+github: hyperpolymath
+ko_fi: hyperpolymath
+liberapay: hyperpolymath