chore: refactor rust

[lightsing]

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[Copilot]

Pull request overview

Refactors the Rust portion of the codebase to move off nightly-only features, introduces a new uts-sdk Rust SDK crate (stamp/upgrade/verify), and updates other language SDKs + CLI defaults to include additional public calendars.

Changes:

• Switch Rust toolchain from pinned nightly to a stable channel and remove several nightly feature gates across crates.
• Add a new packages/sdk-rs crate implementing stamping, upgrading pending attestations, and verification (EAS/Bitcoin verifiers behind features).
• Update default calendar lists across TS/Python/Go (and Rust builder) and refactor CLI commands to use the new Rust SDK.

Reviewed changes

Copilot reviewed 52 out of 53 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
rust-toolchain.toml	Pins the workspace toolchain to a stable Rust version.
packages/sdk-ts/src/sdk.ts	Expands default calendar endpoints and annotates operators.
packages/sdk-py/src/uts_sdk/sdk.py	Expands default calendar endpoints and annotates operators.
packages/sdk-go/sdk.go	Expands default calendar endpoints and annotates operators.
packages/sdk-rs/Cargo.toml	Introduces the new Rust SDK crate and feature flags.
packages/sdk-rs/src/lib.rs	Adds SDK core + shared HTTP-with-retry helper.
packages/sdk-rs/src/builder.rs	Adds SDK builder with default calendars/quorum/retry configuration.
packages/sdk-rs/src/stamp.rs	Adds stamping implementation (digest, Merkle aggregation, calendar requests).
packages/sdk-rs/src/upgrade.rs	Adds pending-attestation upgrade flow via calendar retrieval.
packages/sdk-rs/src/verify.rs	Adds file digest verification + attestation verification aggregation.
packages/sdk-rs/src/error.rs	Adds SDK error type and conversions.
crates/stamper/src/lib.rs	Removes bytemuck usage; adjusts Merkle tree/root and raw-bytes storage call sites.
crates/stamper/src/kv.rs	Removes bytemuck bounds in DB extension trait.
crates/stamper/Cargo.toml	Drops bytemuck dependency.
crates/relayer/src/relayer.rs	Adjusts Merkle root conversion and fixes U256 gas fee multiplication casting.
crates/core/src/verifier/eas.rs	Makes EAS verifier methods public and re-exports error type.
crates/core/src/verifier/bitcoin.rs	Adds Bitcoin verifier implementation and tests (ignored network test).
crates/core/src/verifier.rs	Wires Bitcoin verifier module + error plumbing and re-exports.
crates/core/src/lib.rs	Introduces allocator-api2-backed alloc re-export module; removes nightly/no_std scaffolding.
crates/core/src/utils.rs	Removes custom OnceLock wrapper re-export.
crates/core/src/utils/sync/std.rs	Removes custom std OnceLock wrapper.
crates/core/src/utils/sync/race.rs	Removes once_cell race OnceLock wrapper.
crates/core/src/tracing.rs	Removes custom tracing shim in favor of always-on tracing dependency.
crates/core/src/error.rs	Removes std feature gating around I/O errors.
crates/core/src/codec/v1/timestamp/fmt.rs	Updates allocator-aware vector conversions.
crates/core/src/codec/v1/timestamp/builder.rs	Switches to allocator-api2 SliceExt patterns and std OnceLock.
crates/core/src/codec/v1/timestamp.rs	Switches to allocator-api2 SliceExt patterns and std OnceLock.
crates/core/src/codec/v1/opcode.rs	Refactors allocator usage to new crate::alloc and SliceExt conversions.
crates/core/src/codec/v1/digest.rs	Refactors allocator import and tracing instrumentation.
crates/core/src/codec/v1/detached_timestamp.rs	Fixes Deref/DerefMut to be generic over allocator.
crates/core/src/codec/v1/attestation.rs	Refactors imports and OnceLock usage.
crates/core/src/codec/v1.rs	Removes std feature gating around Error impl.
crates/core/src/codec/proof.rs	Adds Deref/DerefMut for VersionedProof.
crates/core/src/codec/imp/primitives.rs	Refactors allocator bounds and changes LEB128 decoding logic.
crates/core/src/codec/imp.rs	Refactors imports; adds Encoder impl for std::vec::Vec<u8>.
crates/core/src/codec.rs	Refactors allocator imports and removes std feature gating for Reader/Writer exports.
crates/core/Cargo.toml	Adds allocator-api2 and reorganizes features (bitcoin verifier, tls options, etc.).
crates/cli/src/main.rs	Switches from stderr print to tracing subscriber initialization + warn log.
crates/cli/src/commands/stamp.rs	Refactors stamping to use uts-sdk.
crates/cli/src/commands/upgrade.rs	Refactors upgrade to use uts-sdk and adds keep_pending/optional timeout.
crates/cli/src/commands/verify.rs	Refactors verification to use uts-sdk.
crates/cli/src/commands/inspect.rs	Switches CLI output from stderr to tracing logs.
crates/cli/src/client.rs	Removes global reqwest client singleton (now handled by SDK).
crates/cli/Cargo.toml	Drops direct deps on old verification/stamp plumbing; depends on uts-sdk.
crates/calendar/src/time.rs	Removes sleep_until usage; uses checked sleep duration instead.
crates/calendar/src/routes/ots.rs	Removes bytemuck usage and adjusts Merkle proof leaf typing.
crates/calendar/src/lib.rs	Removes nightly feature gates.
crates/calendar/Cargo.toml	Drops bytemuck and nightly hashbrown dependencies.
crates/bmt/src/lib.rs	Removes bytemuck and replaces raw-bytes APIs with allocating conversions.
crates/bmt/benches/tree_construction.rs	Removes benchmark file.
crates/bmt/Cargo.toml	Drops bytemuck/hybrid-array and removes benchmark dev-deps/bench config.
Cargo.toml	Adds packages/sdk-rs to workspace and introduces allocator-api2/backon/http deps.
Cargo.lock	Updates dependency graph accordingly (removes bytemuck/commonware/old digest RCs, etc.).

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