fix: extend dev seed readiness timeout

[daryllimyt]

Summary

• Increase the dev cluster seed readiness wait from 2 minutes to 5 minutes.
• Update dev-seed status messages to report the 5-minute wait budget.

Testing

• bash -n scripts/cluster
• shellcheck -x scripts/cluster
• uv run ruff check .

---

Summary by cubic

Increase dev-seed API readiness wait in scripts/cluster from 2 to 5 minutes to reduce flakiness on slower startups. Updated log messages to reflect the 5-minute wait window.

^{Written for commit 15fc83c. Summary will update on new commits. Review in cubic}

[zeropath-ai]

✅ No security or compliance issues detected. Reviewed everything up to 15fc83c.

Security Overview

• 🔎 Scanned files: 1 changed file(s)
• 🔗 Scan Link: https://zeropath.com/app/repositories/00dffd6c-8834-4dc9-b6d8-b44cd1622986?scanId=d0cb04bd-8708-4701-bf50-86717072dc5c&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type	Relevant files
Enhancement	► scripts/cluster     Increase API readiness check timeout and update related log messages

[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}