The plan is complete. Here's the implementation plan summary:

Extend sw-fleet.sh with a discover subcommand and fleet_rediscover_loop() background loop (same pattern as the existing fleet_rebalance() loop). Uses gh api REST calls for org repo listing, consistent with existing GitHub API patterns. Only 3 files need changes.

1. Add CLI argument parsing for discover flags (--org, --language, --activity-days, --topic, --has-issues, --include-forks, --merge, --dry-run)
2. Implement fleet_discover() — GitHub org API call with pagination via gh api /orgs/{org}/repos --paginate
3. Implement filters — language, activity window, topics, has-issues, archived/disabled/fork exclusion
4. Implement opt-out — shipwright-ignore topic + .shipwright-ignore file detection
5. Implement config generation — build fleet-config.json, support --merge with existing config
6. Implement --dry-run mode
7. Implement fleet_rediscover_loop() — periodic background re-discovery with auto_discover config key
8. Implement fleet_add_repo() — hot-add new repos to running fleet
9. Add topology display to fleet_status() — repos, machines, workers, auto-discover status
10. Wire discover into command router and help text
11. Update load_fleet_config() to parse auto_discover settings
12. Write 13 test cases in sw-fleet-test.sh
13. Update .claude/CLAUDE.md documentation
14. Run full test suite and fix failures

• Config schema: New auto_discover block in fleet-config.json with enabled, org, interval_seconds, and filters (language, activity_days, has_issues, topics, include_forks)
• Opt-out: Repos with shipwright-ignore topic in GitHub are excluded. Repos with a .shipwright-ignore file are also excluded (checked via gh api /repos/{owner}/{repo}/contents/.shipwright-ignore)
• Re-discovery loop: Background process (like rebalancer) runs every interval_seconds, calls discover with --merge, signals fleet via fleet-rediscover.flag for hot-addition
• Topology in status: Repos grouped by machine (local/remote), workers allocated, active/queued jobs, last activity, auto-discover last scan time
• All Bash 3.2 compatible, atomic writes, NO_GITHUB env var respected