The templates were written against Gitea's schema alone, but the mirror
serves the same .github/ISSUE_TEMPLATE/ files to GitHub, where two of them
would have silently failed:
- **config.yaml -> config.yml.** Gitea accepts either spelling
(modules/structs/issue.go: `base == "config.yaml" || base == "config.yml"`),
GitHub only recognizes config.yml. Under the old name the mirror's
template chooser would have shown neither the contact links nor the
blank-issue setting.
- **bug.yaml `about:` -> bug.yml `description:`.** GitHub requires
`description` on a YAML issue form; Gitea's IssueTemplate.About carries
the comment "Using description in a template file is compatible" and
falls back to it at modules/issue/template/unmarshal.go:126. So
`description` is the one spelling both forges accept. The markdown
templates keep `about:`, which is correct for their format on both.
Both files now carry a comment explaining the constraint, so neither gets
"tidied" back into a broken state.
Also add a contact link pointing at the canonical Gitea tracker, so someone
arriving from the mirror is steered to the right place before they file,
and document mirror parity in CONTRIBUTING.md: the labels must be created
on both sides by hand, since mirroring copies files rather than repository
settings and GitHub drops a labels: entry naming a label it doesn't have.
Note too that GitHub has no exclusive labels, so the one-of rule on
Priority/, Reviewed/, and Status/ holds only by convention there.
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