fix: validator uses Subtensor.set_mechanism_weights() for CRv4

[echobt]

• Subtensor handles CRv4/commit-reveal automatically based on chain config
• Fetch weights from platform-server each epoch
• Submit burn weights (UID 0) if no challenges available
• Reveal pending commits in RevealWindowOpen (for non-CRv4)
• Clean centralized architecture (no P2P)

Summary by CodeRabbit

Release Notes

• New Features

  • Weight submission now integrates with Subtensor persistence layer for enhanced state management.
  • Automatic reveal handling for validator transactions replaces manual process.
  • Validator node operates in centralized validator mode.

• Updates

  • Streamlined dependency footprint for reduced complexity.
  • Enhanced validator submission workflow with improved reliability.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

The validator-node crate undergoes dependency cleanup and major control-flow refactoring. Cargo.toml removes unused platform and utility crates while standardizing workspace dependencies. Main.rs integrates Subtensor persistence with CRv4-aware submission, updates CLI arguments, and modifies handle_block_event to wire in new signer and Subtensor parameters throughout the event loop.

Changes

Cohort / File(s)	Summary
Dependency Cleanup bins/validator-node/Cargo.toml	Removed platform crates (network, consensus, storage, challenge-runtime, etc.) and utility crates (futures, uuid, sha2, chrono, rand). Retained core platform dependencies and switched to workspace = true for shared crates (bittensor-rs, tokio, serde, reqwest, etc.).
Subtensor Integration & Function Signature Refactor bins/validator-node/src/main.rs	Added version_key to Args; integrated Subtensor::with_persistence for state persistence; replaced BlockSync with Subtensor-backed weight submission. Updated handle_block_event signature to accept platform_client, subtensor, signer, netuid, version_key. Implemented CRv4-aware reveals and commit-window weight translation. Added Arc wrapping for platform_client and optional subsystems; adjusted logging to reflect centralized validator mode.

Sequence Diagram

sequenceDiagram
    participant EvtLoop as Event Loop
    participant Handler as handle_block_event
    participant PSClient as PlatformServerClient
    participant Subtensor
    participant Signer as BittensorSigner
    
    EvtLoop->>Handler: block_event + platform_client + subtensor + signer + netuid + version_key
    
    rect rgb(230, 245, 240)
        Note over Handler: COMMIT WINDOW
        Handler->>PSClient: fetch platform weights
        PSClient-->>Handler: weights
        Handler->>Handler: translate to mechanism weights
        Handler->>Signer: create signature
        Signer-->>Handler: signature
        Handler->>Subtensor: submit weights via ExtrinsicWait
        Subtensor-->>Handler: submission confirmed
    end
    
    rect rgb(245, 240, 230)
        Note over Handler: REVEAL WINDOW
        Handler->>Subtensor: trigger automatic reveal (CRv4)
        Subtensor-->>Handler: reveal complete
    end

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Estimated code review effort

🎯 4 (Complex) | ⏱️ ~40 minutes

Poem

🐰 A validator hops with glee,
Dependencies fall from the tree,
Subtensor's persistence takes the stage,
CRv4 reveals mark a brand new age,
With tighter bonds and cleaner code to see! 🌿✨

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch dev

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📜 Recent review details

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Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 66477bd and 3e0b1e5.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (2)

• bins/validator-node/Cargo.toml
• bins/validator-node/src/main.rs

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