feat(org): add profile README and community health templates

[hkimw]

Summary

• Replace the org profile with a short evidence-gated overview and active-lane links.
• Replace broad issue forms with bug, feature, and evidence templates using kv260 label conventions.
• Shorten the PR template and keep security/conduct placeholders.

Evidence State

Evidence state: YAML parsed; diff check clean; public wording scan clean; shellcheck unavailable, marked and proceeded.

Review

• Scope is bounded to org profile and community health files.
• No repo settings, release, tag, or visibility changes.