Fix potential auto restart failure due to blocksync always true

[yzang2019]

Describe your changes and provide context

Problem identified:

• In autoRestartIfBehind we use the blockSync as a flag to determine if already lag behind to avoid additional restart signals.
• At the same time, the restart has a "cool down" period -- meaning, restart signals during cool down period are silently ignored.
• Now, if a node restarts during cool down period, the signal gets ignored and the blockSync flag will remain indefinitely true effectively disabling the self-remediation process

Fix:

• Do not set blocksync mode in auto restart handler

Testing performed to validate your change

Added unit test

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 13, 2026, 7:55 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.35%. Comparing base (7407960) to head (3aad0c6).
⚠️ Report is 238 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (7407960) and HEAD (3aad0c6). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (7407960)	HEAD (3aad0c6)
sei-chain	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2892       +/-   ##
===========================================
- Coverage   57.15%   48.35%    -8.81%     
===========================================
  Files        2091      671     -1420     
  Lines      171524    50615   -120909     
===========================================
- Hits        98033    24474    -73559     
+ Misses      64751    24000    -40751     
+ Partials     8740     2141     -6599     

Flag	Coverage Δ
sei-chain	?
sei-cosmos	48.16% <ø> (+<0.01%)	⬆️
sei-db	68.72% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.
see 1543 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[github-actions]

We truly appreciate your contribution and the time you’ve invested in this PR.
Before we can merge it, we’d love your help addressing the remaining feedback or sharing your perspective.
If we don’t hear back within 2 day(s), this PR will close automatically — but don’t worry, you can reopen it anytime when you’re ready to continue.

[masih]

@yzang2019 OK to close this?