fix(ci): stabilize SP1 E2E proof assertions

[voidash]

Summary

• retry signet startup to tolerate public ECR throttling
• keep real SP1 coverage: one confirmed checkpoint proof plus one accepted and checkpoint-confirmed SAU/SNARK update
• keep CI on the reserved SP1 proving path; auction proving should be handled separately once funding/account ownership is coordinated
• keep proof wait time aligned with SP1 network behavior while preserving the SAU epoch confirmation assertion

Verification

• bash -n .github/sp1-e2e/run-test.sh
• Ruby YAML parse for .github/workflows/ci-sp1-e2e.yml
• SP1 E2E passed previously: https://github.com/alpenlabs/alpen/actions/runs/26934551683

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[github-actions]

Commit: 16bcf80

SP1 Execution Results

program	cycles	gas
EVM EE Chunk	824,732	969,395
EVM EE Account	404,056	498,593
Checkpoint	2,601,525	3,007,269

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.44%. Comparing base (1c9a7a5) to head (2a8307e).
⚠️ Report is 6 commits behind head on main.

@@            Coverage Diff             @@
##             main    #1938      +/-   ##
==========================================
+ Coverage   84.30%   84.44%   +0.14%     
==========================================
  Files         633      637       +4     
  Lines       75681    76670     +989     
==========================================
+ Hits        63803    64747     +944     
- Misses      11878    11923      +45     

Flag	Coverage Δ
functional	66.41% <ø> (+0.57%)	⬆️
unit	69.76% <ø> (+0.05%)	⬆️

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see 97 files with indirect coverage changes

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[purusang]

@voidash It was an agreed condition to ensure an epoch containing SAU is verified.
Could you update it accordingly!

Also if the main issue was signet image download being throttled why retries won't fix this? Regarding two epochs being proven and confirmed it used to happen within 15-20 mins so why nowadays it is not happening in 40mins?

[purusang]

The issue is in SP1 side so may be we should move from centralized reserved network to decentralized prover servies.