Tests added for existing JsonSchema in
`codex-rs/tools/src/json_schema_tests.rs`:
- `parse_tool_input_schema_coerces_boolean_schemas`
- `parse_tool_input_schema_infers_object_shape_and_defaults_properties`
- `parse_tool_input_schema_normalizes_integer_and_missing_array_items`
- `parse_tool_input_schema_sanitizes_additional_properties_schema`
-
`parse_tool_input_schema_infers_object_shape_from_boolean_additional_properties_only`
- `parse_tool_input_schema_infers_number_from_numeric_keywords`
- `parse_tool_input_schema_infers_number_from_multiple_of`
-
`parse_tool_input_schema_infers_string_from_enum_const_and_format_keywords`
- `parse_tool_input_schema_defaults_empty_schema_to_string`
- `parse_tool_input_schema_infers_array_from_prefix_items`
-
`parse_tool_input_schema_preserves_boolean_additional_properties_on_inferred_object`
-
`parse_tool_input_schema_infers_object_shape_from_schema_additional_properties_only`
Tests that we expect to fail on the baseline normalizer, but pass with
the new JsonSchema:
- `parse_tool_input_schema_preserves_nested_nullable_type_union`
- `parse_tool_input_schema_preserves_nested_any_of_property`
## Why
`parse_tool_input_schema` and the supporting `JsonSchema` model were
living in `core/src/tools/spec.rs`, but they already serve callers
outside `codex-core`.
Keeping that shared schema parsing logic inside `codex-core` makes the
crate boundary harder to reason about and works against the guidance in
`AGENTS.md` to avoid growing `codex-core` when reusable code can live
elsewhere.
This change takes the first extraction step by moving the schema parsing
primitive into its own crate while keeping the rest of the tool-spec
assembly in `codex-core`.
## What changed
- added a new `codex-tools` crate under `codex-rs/tools`
- moved the shared tool input schema model and sanitizer/parser into
`tools/src/json_schema.rs`
- kept `tools/src/lib.rs` exports-only, with the module-level unit tests
split into `json_schema_tests.rs`
- updated `codex-core` to use `codex-tools::JsonSchema` and re-export
`parse_tool_input_schema`
- updated `codex-app-server` dynamic tool validation to depend on
`codex-tools` directly instead of reaching through `codex-core`
- wired the new crate into the Cargo workspace and Bazel build graph
