* chore: add issue forms, PR template, contributor guidance
- bug report and feature request issue forms with structured fields for surface, version, provider, logs, screenshots
- issue config disables blank issues and routes casual questions to Discord
- single PR template with explicit verification section and AI-assisted contribution stance
- CONTRIBUTING.md: soften drive-by stance for objective bug fixes, codify expectations on AI-assisted reports and PRs (full logs over summaries, proof of testing over prose)
* chore: drop BDFL framing for one-person team
* chore: tighten CONTRIBUTING, drop duplication
