fix: fix all broken builds and tests across the repo

[mikemaccana-edwardbot]

Summary

Fixes all broken Native tests, Anchor builds, and compression projects. Migrates all borsh usage from deprecated v0.7 API to v2. Removes references to frameworks not present in the repo.

Native tests (16/16 passing)

• counter/native & escrow/native: add bn.js as explicit dependency. pnpm's strict dependency resolution does not hoist transitive deps (unlike npm), so bn.js from @solana/web3.js is not accessible directly.
• All native tests using borsh: migrate from borsh v0.7 class-based API to borsh v2 object schema API. The v0.7 API (Map schemas, Assignable classes, 3-arg deserialize) is incompatible with borsh v1+. Updated 19 test files and 14 package.json files. Introduced a shared borshSerialize(schema, data) helper to replace the repeated Buffer.from(borsh.serialize(...)) pattern. Removed per-schema typed wrappers in favour of exporting schemas directly.
• create-account/native: replace litesvm with solana-bankrun. litesvm's native binary crashes with SIGABRT on Linux x64 (LiteSVM/litesvm#171). This was the only native test using litesvm — all others use solana-bankrun, the recommended framework per CONTRIBUTING.md.
• TypeScript 4.x → 5.x in 10 token projects. TS4 can't parse @solana/codecs-data-structures type definitions. Also fix Keypair.fromSecretKey(Buffer.from(...)) to use Uint8Array.from() for TS5 compatibility.

Anchor builds (39/39 passing)

• Set solana_version = "3.1.8" in all 49 Anchor.toml files. Anchor's default BPF toolchain ships rustc 1.79, but anchor-lang 0.32.1's dependency tree requires rustc 1.82+ (indexmap 2.13.0) and Cargo's edition2024 feature. Solana 3.1.8 platform-tools v1.52 (rustc 1.89) resolves both. All projects now use a consistent toolchain version.
• allow-block-list-token: bump spl-transfer-hook-interface 0.8.2 → 2.1.0, spl-tlv-account-resolution 0.8.1 → 0.11.1, spl-discriminator 0.3 → 0.5.1. Old SPL versions used solana-program v1, causing type mismatches with anchor-lang 0.32.1's v2 types. litesvm Rust test moved to tests-rs/ because litesvm pins solana-account-info =2.2.1 but anchor-lang 0.32.1 needs >=2.3.0 for AccountInfo::resize(). See tests-rs/README.md.

Compression projects (3/3 building)

• Rewrite cnft-burn, cnft-vault, cutils from anchor-lang 0.26.0 to 0.32.1. Upgrade to mpl-bubblegum 2.1.1 + spl-account-compression 1.0.0 (both use solana-program v2, matching anchor-lang 0.32.1). cnft-vault: manual invoke_signed rewritten to TransferCpi. cutils verify: raw invoke because spl-account-compression 1.0.0's CPI module is built against anchor-lang 0.31, which has incompatible traits with 0.32.1. Discriminator computed from sha256("global:verify_leaf") rather than hardcoded. Comment documents when this workaround can be removed.

Documentation

• README: remove TypeScript/Poseidon references (none exist in repo), Anchor before Native in badges, fix typos.
• CONTRIBUTING: remove Steel/Python/Solidity/Poseidon references (none exist in repo), fix markdown, renumber sections.

[mikemaccana]

@ZYJLiu this should fix all the broken tests in program-examples - can you please trigger the workflow? Thanks. 🙏