Add repository CWD to Rust model listing

[eljog]

Summary

• add optional cwd to Rust ModelsListRequest so callers can resolve repository-scoped model availability before a session exists
• preserve account-global behavior when cwd is omitted
• augment the pinned runtime schema during Rust codegen until the upstream contract includes the field, while deferring to the schema once it does
• cover generated serialization, default omission, and typed models.list RPC framing

Validation

• cargo +nightly-2026-04-14 fmt --check
• cargo clippy --all-features --all-targets -- -D warnings
• cargo test --all-features --test api_types_test --test session_test models_list
• deterministic Rust codegen regeneration check

[Copilot]

Pull request overview

Adds repository-scoped model availability to the Rust SDK.

Changes:

• Augments Rust codegen with optional cwd.
• Regenerates ModelsListRequest.
• Tests serialization and RPC framing.

Show a summary per file

File	Description
scripts/codegen/utils.ts	Adds schema augmentation for cwd.
scripts/codegen/rust.ts	Applies augmentation during Rust generation.
rust/src/generated/api_types.rs	Adds generated cwd field.
rust/tests/api_types_test.rs	Tests serialization and omission.
rust/tests/session_test.rs	Tests models.list RPC framing.

Review details

• Files reviewed: 4/5 changed files
• Comments generated: 1
• Review effort level: Balanced