docs(agent): accept maintainer-authored issues

[krishicks]

Summary

Makes it so the agent does what I say when I want it to work on an issue a maintainer created, but which doesn't have the non-required state:accepted label for an issue created by a maintainer.

Related Issue

Changes

Testing

• mise run pre-commit passes
• Unit tests added/updated
• E2E tests added/updated (if applicable)

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)
• Architecture docs updated (if applicable)

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[elezar]

Changes requested

P1 — Include write-level maintainers: The repository’s issue-triage workflow treats write alongside maintain and admin as maintainer permission. Excluding it here means issues authored by write-level maintainers remain blocked despite this PR’s goal; use the same permission set or document why it differs.

While working on some triage tooling, I noted some inconsistency in the triage skill with respect to the new state labels and opened #2809 to address that. This PR and #2809 overlap in .agents/skills/triage-issue/SKILL.md, so they will need to be reconciled when this change is updated.