Expand ty type-checking coverage in AutoModel

Feature Request

Expand AutoModel's ty type-checking coverage beyond the current Phase 1 modules.

ty is already configured in pyproject.toml and enforced in CI, but strict checks are currently active only for attention, config, launcher, loggers, and optim modules. We should gradually enable the existing Phase 2/Phase 3 targets and fix the resulting type issues.

Proposed Scope

• Enable the next tool.ty.overrides target group in pyproject.toml.
• Fix reported ty errors without broadening ignores unnecessarily.
• Keep CI type_checking passing.
• Preserve the phased rollout so future modules can be added incrementally.

Acceptance Criteria

• Additional AutoModel modules are checked by ty in CI.
• No new broad unresolved-import or unresolved-reference suppressions are added unless justified.
• The active coverage list in pyproject.toml reflects the expanded scope.