Update lencode and safe-bigmath

[UnArbosFour]

Motivation

Update safe-bigmath to its 0.4.2 revision and align the workspace's lencode dependency with the version required by that release.

Changes

• Updated the pinned safe-bigmath Git revision from 0.4.1 to 0.4.2.
• Updated lencode and lencode-macros from 0.1.6 to 1.2.1.
• Regenerated Cargo.lock to capture the resulting transitive dependency changes.

Behavioral impact

No Subtensor source code or public API is changed directly. The updated libraries are used by the swap pallet's high-precision arithmetic implementation, so existing swap tests and workspace CI should validate compatibility.

Migration and spec version

No storage migration is required. The PR targets release-449, which has no corresponding live-network spec-version check, so this dependency-only change does not include a spec-version bump.

Validation

The lockfile is consistent with the manifest changes, and git diff --check passes. Full compilation and tests are delegated to CI; local Cargo validation was unavailable because the existing toolchain/cache directories were read-only.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
subtensor	Ready	Preview	Aug 21, 2026 4:58pm

[github-actions]

🛡️ AI Review — Skeptic (security review)

VERDICT: SAFE

VERY HIGH scrutiny (account under 90 days and one public repository), mitigated by repository write access; no Gittensor association found; branch chore/update-lencode → release-449.

Static analysis covered the complete dependency-only diff. Both direct updates are immutably resolved by a Git revision or registry checksum; no review trust-boundary, runtime logic, origin, or CI workflow changes are present.

Findings

No findings.

Conclusion

No malicious behavior or concrete security vulnerability was found in the dependency update.

---

🔍 AI Review — Auditor (domain review)

VERDICT: 👍

UNKNOWN Gittensor association; newer account with substantial repository activity and write access.

This remains a coherent, lockfile-complete dependency update: safe-bigmath 0.4.2 and its required lencode 1.2.1 release move together. The overlapping PRs only share workspace manifests and are not functional duplicates.

git diff --check passed and the worktree is clean. cargo fmt --check --all could not run because rustup attempted to write to a read-only toolchain directory; no files were modified. No spec-version bump is required for the release-449 base.

Findings

No findings.

Conclusion

The dependency and lockfile changes are consistent, narrowly scoped, and present no concrete domain-correctness issue. CI should provide the unavailable formatting and compilation validation.

[github-actions]

🔄 AI review updated — Skeptic: SAFE

[github-actions]

🔄 AI review updated — Skeptic: SAFE Auditor: 👍

[github-actions]

🔄 AI review updated — Skeptic: SAFE Auditor: 👍