chore: fix Rust clippy/fmt errors and add Rust linting to CI

[simongdavies]

• Fix clippy errors: unwrap_used, manual_strip, dead code, needless_range_loop
• Allow expect_used on static regex patterns in plugin_scan.rs
• Add check-cfg for cfg(hyperlight) in native-globals Cargo.toml
• Format all Rust code (analysis-guest + sandbox runtime)
• Update CI to use just lint-all + test-all (adds Rust lint/fmt/clippy)
• Rename just recipes for clarity: lint-rust -> lint-analysis-guest, etc.
• Update all docs to reflect renamed recipes

[Copilot]

Pull request overview

This PR tightens Rust quality gates across the repo by fixing clippy/fmt issues in the Rust guest/runtime code, standardizing just recipes, and updating CI + documentation to run the full TS+Rust lint/test suite.

Changes:

• Fix Rust clippy warnings and apply Rustfmt across the analysis guest/runtime and sandbox runtime modules.
• Rename just recipes (e.g. test-rust → test-analysis-guest) and update CI to run just lint-all + just test-all.
• Add unexpected_cfgs check-cfg configuration to silence cfg(hyperlight) warnings in Cargo manifests.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/CLAUDE.md	Updates test commands to the renamed just test-analysis-guest recipe.
src/sandbox/runtime/src/main.rs	Import ordering tweak to satisfy formatting/lints.
src/sandbox/runtime/modules/native-globals/src/lib.rs	Rustfmt-only changes around string eval blocks and whitespace stripping.
src/sandbox/runtime/modules/native-globals/Cargo.toml	Adds check-cfg for cfg(hyperlight) to avoid unexpected_cfgs warnings.
src/code-validator/guest/runtime/src/validator.rs	Refactors conditionals/loops to satisfy clippy (let-chains, is_some_and, etc.).
src/code-validator/guest/runtime/src/plugin_scan.rs	Adds a clippy allow for expect_used in static regex construction.
src/code-validator/guest/runtime/src/metadata.rs	Clippy-driven refactors (strip_prefix, let-chains) and minor test assertion formatting.
src/code-validator/guest/runtime/src/lib.rs	Removes an unused Vec import.
src/code-validator/guest/runtime/src/js_parser.rs	Clippy-driven refactors (let-chains, safer Option handling).
src/code-validator/guest/README.md	Updates docs to the renamed Rust test recipe.
src/code-validator/guest/host/src/sandbox.rs	Minor import organization + simplifies runtime-handle error construction.
src/code-validator/guest/host/src/runtime.rs	Refactors shutdown flow using let-chains (clippy/clarity).
Justfile	Renames Rust recipes and updates aggregate targets (lint-all, fmt-all, test-all).
docs/DEVELOPMENT.md	Updates developer documentation to the renamed just recipes.
CLAUDE.md	Updates top-level instructions for new just recipe names.
.github/workflows/pr-validate.yml	CI now runs just lint-all and just test-all for the lint/test job.
.github/instructions/tests.instructions.md	Updates test instructions to just test-analysis-guest.
.github/copilot-instructions.md	Updates instruction docs for the renamed Rust test recipe.
.claude/CLAUDE.md	Updates Claude instructions for the renamed just recipes.