test(cli): lock managed reconnect ensure-on-first-failure

[armancharan]

Issue for this PR

Closes #36581

#36581

Parent epic: #36441

✧ raised · ○ in review · ● approved · ✓ merged

#36441 epic: scope streams + bound payloads

Merge in order:
v2
└ ○ #37486 location interest
   └ ○ #37487 session interest + fan-out bench
      └ ○ #37585 stream ownership / diagnostics
         └ ○ #37586 reconnect herd

Siblings under the epic (not git parents of the stack tip):
└ ○ #37559 session blobs + payloadHash
└ ○ #37570 ensure-on-first-failure ← this PR → feeds #37586

Builds toward #36285.

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

The ensure-on-first-failure reconnect policy already landed with the managed service lifecycle work (ServerConnection reconnect → Service.ensure with version: undefined; TUI calls it on every stream drop).

This adds the missing regression coverage from #36581:

1. First failed reconnect runs ensure immediately (onStart("missing"))
2. Passive reconnect reuses a healthy service from another version instead of replacing it

Also exports ServerConnection.managedReconnect so that policy is testable without going through the full resolve path.

How did you verify your code works?

• bun test test/server-connection.test.ts --timeout 30000
• bun run typecheck in packages/cli

Acceptance

Claim	Test
First failed reconnect invokes ensure-running	managed reconnect ensures the service on the first failure
Healthy version-mismatched service is reused	managed reconnect reuses a healthy service from another version

Screenshots / recordings

n/a

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

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