Replace tiangolo/issue-manager with custom logic that distinguishes
bot comments from human responses. The issue-manager action treated
all comments equally, so the bot's own instruction comment would
trigger label removal on the next scheduled run.
Split into two jobs:
- remove-label-on-response: triggers on issue_comment from non-bot
users, removes the needs-more-info label immediately
- close-stale: runs on daily schedule, uses nushell to iterate open
needs-more-info issues, checks for human comments after the label
was added, and closes after 3 days with no response
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