Add a mandatory self-identification disclosure (model, harness, harness
version, all installed plugins) to the PR template and all three issue
templates, and document the requirement in the contributor guidelines.
We weigh contributions differently depending on what produced them:
content reasoned from documentation is held to a different bar than work
grounded in a real session.
Also state explicitly, in both CLAUDE.md and the PR template, that all
PRs must target the dev branch rather than main.
Four templates: bug report (with environment table and platform-vs-plugin
gate), feature request (with problem statement and core-appropriateness
question), IDE/platform support request, and a config that disables
blank issues and redirects questions to Discord.
