test(redshift): cover transaction retries and replay protection

[bzawisto]

What changed

Add five retry scenarios covering cold-fetch recovery, concurrent successful and failed transactions, signature subscriptions, blockhash expiry, and same-storage restart.

Closes #115

Impact

Verify exact signed-byte reuse, single execution, rollback, and payer fees. No validator changes; current ER execution fees are zero.

Reviewer notes

Build, lint, and catalog checks pass. The full redshift lite suite passed 36/37 before final burst expansion; the final retry run passed 3/5.

The tests expose timing-sensitive runtime subscription bugs: AlreadyProcessed can replace the actual execution result, and terminal notifications can be missed. State, fee, and ledger assertions remain
strict.

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Reviewing files that changed from the base of the PR and between 1884174 and fd2ebf5.

📒 Files selected for processing (3)

• README.md
• cli/src/catalog.rs
• redshift/src/scenarios/aperture/transaction_retries.rs

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• README.md

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📝 Walkthrough

Walkthrough

Adds five private ER aperture scenarios for identical transaction retries. The scenarios cover cold-fetch recovery, concurrent submissions, failed execution, signature subscriptions, blockhash expiry, and same-storage restart.

Changes

Transaction retry validation

Layer / File(s)	Summary
Retry contracts and registration redshift/Cargo.toml, redshift/src/scenarios/aperture/..., cli/src/catalog.rs	Defines TransactionRetries, constructs and submits signed transactions, checks outcomes, and registers five private ER scenarios.
Execution and ledger validation redshift/src/scenarios/aperture/transaction_retries.rs	Queues competing readers, verifies concurrent submissions and signature notifications, and audits published ledger occurrences.
Scenario cases and test integration redshift/src/scenarios/aperture/transaction_retries.rs, .config/nextest.toml, README.md	Implements cold-fetch, concurrent success and failure, subscription, expiry, and restart cases. Updates test filtering and scenario documentation.

Priority: ⬇️ Low

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Other

Sequence Diagram(s)

sequenceDiagram
  participant Scenario
  participant NetworkProxies
  participant PrivateER
  participant Ledger
  Scenario->>NetworkProxies: submit identical signed bytes
  NetworkProxies->>PrivateER: forward or reject RPC requests
  PrivateER-->>Scenario: return transaction status and execution error
  PrivateER->>Ledger: publish accepted transaction
  Scenario->>Ledger: audit signature occurrences

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Merge Risk: 🟡 Moderate · up to fd2eb

The subscription test can pass without validating notifications registered during execution. Resolve this timing gap before merging so the retry coverage enforces the stated subscription contract.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 3 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding Redshift coverage for transaction retries and replay protection.
Description check	✅ Passed	The description directly explains the five retry scenarios, their validation goals, and their test impact. It is related to the changeset.
Linked Issues check	✅ Passed	The pull request satisfies the coding requirements in #115. transaction_retries adds five scenarios for cold-fetch recovery, concurrent success and failure, subscriptions, and expiry or same-storage…
Out of Scope Changes check	✅ Passed	The changes remain within #115. The scenario module, catalog entries, nextest configuration, README entries, and bincode dependency directly support the retry validation tests. No validator behavior…

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 3 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
In `@redshift/src/scenarios/aperture/transaction_retries.rs`:
- Around line 171-174: Update the concurrent execution flow around tokio::join!,
tx.copies, and subscribe so transaction execution pauses at an explicit
checkpoint until at least one subscription has received its acknowledgment.
Release the checkpoint only after that acknowledgment, then allow execution to
reach tx.outcome; preserve the existing four-subscription setup and notification
assertions.

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⛔ Files ignored due to path filters (1)

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📒 Files selected for processing (6)

• .config/nextest.toml
• README.md
• cli/src/catalog.rs
• redshift/Cargo.toml
• redshift/src/scenarios/aperture/mod.rs
• redshift/src/scenarios/aperture/transaction_retries.rs

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[bzawisto]

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