test: staker migration more flows

[noa-starkware]

Note

Adds three staker attestation migration flows (V0/V1 paths) with reward assertions and wires them into MAINNET_LATEST fork tests; updates flow ideas doc.

• Tests/Flows:
  • StakerV0AttestFlow: stake in V0, upgrade, multi-epoch attest/increase sequences; assert staker rewards via calculate_staker_strk_rewards_with_balances_v2.
  • StakerV1AttestFlow: stake/increase in V1, upgrade, attest/increase across epochs; assert rewards consistency before/after increases.
  • StakerV1ChangeBalanceAttestFlow: multiple stake increases in V1, upgrade, attest; verify expected rewards.
• Fork Tests:
  • Add MAINNET fork tests for the three new flows in src/flow_test/fork_test.cairo.
• Docs:
  • Update src/flow_test/flow_ideas.md with additional staker migration scenarios.

^{Written by Cursor Bugbot for commit 2ac7a0e. This will update automatically on new commits. Configure here.}

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This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.71%. Comparing base (e565455) to head (2ac7a0e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #80   +/-   ##
=======================================
  Coverage   95.71%   95.71%           
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  Files          42       42           
  Lines        9959     9959           
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  Hits         9532     9532           
  Misses        427      427           

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[NirLevi-starkware]

@NirLevi-starkware reviewed 2 of 3 files at r1, all commit messages.
Reviewable status: 2 of 3 files reviewed, 3 unresolved discussions (waiting on @noa-starkware)

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src/flow_test/flow_ideas.md line 48 at r1 (raw file):

- staker enter in V2, advance epoch, upgrade to V3, advance epoch, attest,
- staker enter in V0, upgrade to V3, attest
- staker enter in V0, advance epoch, update balance, upgrade to V3, attest, update balance, advance epoch, attest

i dont see this flow

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src/flow_test/flow_ideas.md line 50 at r1 (raw file):

- staker enter in V0, advance epoch, update balance, upgrade to V3, attest, update balance, advance epoch, attest
- staker enter in V1, advance epoch, update balance, upgrade to V3, attest, update balance, advance epoch, attest
- staker enter in V0, advance epoch, update balance, advance epoch, update balance, upgrade to V3, attest

i dont see this flow

[noa-starkware]

Reviewable status: 2 of 3 files reviewed, 3 unresolved discussions (waiting on @NirLevi-starkware)

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src/flow_test/flow_ideas.md line 48 at r1 (raw file):

Previously, NirLevi-starkware (Nir Levi) wrote…

i dont see this flow

No epochs in V0

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src/flow_test/flow_ideas.md line 50 at r1 (raw file):

Previously, NirLevi-starkware (Nir Levi) wrote…

i dont see this flow

same

[NirLevi-starkware]

@NirLevi-starkware reviewed 1 of 3 files at r1.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @noa-starkware)