Keep unsupported runner dry-runs inspectable

[s-hiraoku]

Follow-up to #419 and the Phase 1 work tracked in #418.

Summary

• allow fleet dry-runs to inspect migration plans when the configured runner is not locally supported
• keep enabled and schedulerSynced false for those inspect-only plans
• retain fail-closed runner preflight for real scheduler synchronization
• add regression coverage proving dry-run does not mutate config or registry

Verification

• npm test -- --run test/fleet.test.ts (33 passed)
• npm run typecheck
• npm run check:dist
• git diff --check

Refs #418

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📥 Commits

Reviewing files that changed from the base of the PR and between 5a15cab and 49ff5c3.

⛔ Files ignored due to path filters (2)

• dist/commands/fleet.js is excluded by !**/dist/**
• dist/commands/fleet.js.map is excluded by !**/dist/**, !**/*.map

📒 Files selected for processing (2)

• src/commands/fleet.ts
• test/fleet.test.ts

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[s-hiraoku]

@codex review

[s-hiraoku]

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[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Swish!

Reviewed commit: 49ff5c3de4

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[s-hiraoku]

Autopilot verification complete for current head 49ff5c3de41dd832a8d5cf92d1b668c5840fc480.

• local: fleet regression 33 passed; typecheck, dist check, diff check passed
• CI: verify and native-publication-broker passed
• Codex: current-head review found no major issues
• review threads: 0 unresolved
• GitHub: CLEAN / MERGEABLE
• stabilization: unchanged across two snapshots 30+ seconds apart

CodeRabbit is temporarily rate-limited; its status check is successful and no thread was created. This PR is merge-ready. No merge or auto-merge was performed.