Feat/ Move Stake Limit

[UnArbosSix]

Motivation

Moving stake between different hotkeys and subnets currently lacks the slippage protection available to limited stake swaps. This PR adds a price-limited move operation so callers can require a minimum destination-alpha/origin-alpha ratio and choose fill-or-kill or partial execution.

Closes #3081.

Changes

• Adds the move_stake_limit runtime extrinsic and dispatch implementation.
• Adds benchmarking and weight accounting for the new operation.
• Exposes the call through chain extensions, ink!, the staking V2 EVM precompile and ABI, proxy filters, transaction-fee handling, Rust/Python SDK interfaces, and generated calls.
• Enables default slippage protection for cross-subnet Python move_stake intents.
• Adds pallet, chain-extension, precompile, SDK, fee, indexer, and end-to-end test coverage, including fill-or-kill and partial-fill behavior with distinct hotkeys.

Behavioral impact

For cross-subnet moves, limit_price is the minimum acceptable destination-alpha per origin-alpha ratio scaled by 1e9. With allow_partial = false, the call fails atomically when the requested amount cannot execute within the limit. With allow_partial = true, it moves only the amount executable before crossing the limit. Same-subnet moves continue to transfer stake directly between hotkeys.

The Python move_stake intent now selects this limited call by default for cross-subnet moves, using the current origin/destination price ratio and configured tolerance. Users may explicitly disable slippage protection.

Runtime and migration

This is a runtime API/extrinsic change with no storage migration. runtime/src/lib.rs bumps spec_version from 447 to 448.

Testing

Added focused coverage for runtime dispatch, full and partial limit behavior, chain-extension dispatch, EVM precompile dispatch, transaction fees, SDK policy and call construction, generated/indexer compatibility, and a zombienet end-to-end flow.

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Project	Deployment	Actions	Updated (UTC)
subtensor	Ready	Preview	Aug 18, 2026 4:43pm

[github-actions]

eco-tests changed — indexer review required

This PR modifies files under eco-tests/. and may affect downstream indexing.
cc @evgeny-s — please review manually

Changed files

• eco-tests/src/tests_mentat_indexer.rs

[github-actions]

🛡️ AI Review — Skeptic (security review)

VERDICT: SAFE

VERY HIGH account-tier scrutiny (47-day-old account, zero public repos), mitigated by repository write access, substantial merged work, matching primary authorship, and no Gittensor association; feat/move-stake-limit → main.

The added interfaces preserve signed-coldkey authorization and delegate to the established stake-transition path with bounded weight accounting. The latest ABI-vendoring commit introduces no dependency or review trust-boundary changes, and spec_version remains correctly bumped to 448.

Findings

No findings.

Prior-comment reconciliation

• b9754bac: addressed — runtime/src/lib.rs increments spec_version from 447 to 448.

Conclusion

No malicious behavior or security vulnerability was found in the static review. The previously resolved runtime-version concern remains addressed.

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🔍 AI Review — Auditor (domain review)

VERDICT: 👍

Gittensor association: UNKNOWN. Active repository contributor with write access and substantial recent merged work; reviewed with full runtime/economic scrutiny.

The implementation consistently exposes move_stake_limit across the runtime, chain extension, EVM precompile and ABI, SDKs, proxy filters, fee handling, and generated interfaces. It reuses the established limited stake-transition path, includes fill-or-kill and partial-fill coverage, adds a benchmark and weight, and bumps spec_version to 448.

No meaningful duplicate implementation was identified among the overlapping open PRs. Static review was sufficient; no runtime confirmation or auto-fix was needed.

Findings

No findings.

Conclusion

The change is internally consistent, appropriately tested, and follows the established slippage-limited staking design without introducing a substantive correctness issue.

[github-actions]

🔄 AI review updated — Skeptic: VULNERABLE

[github-actions]

🔄 AI review updated — Skeptic: SAFE Auditor: 👍

[github-actions]

🔄 AI review updated — Skeptic: SAFE Auditor: 👍