Flatten property schema validation branching (#36)

[leynos]

Summary

This branch flattens validate_property_schema in the tool schema helper so
array and nested object validation use guard-clause helpers instead of nested
conditionals. The validation rules, error strings and public API remain
unchanged.

Closes #36.

Related review thread: #18.

Review walkthrough

• Start with src/tools/tool/schema_helpers.rs to review the flattened dispatcher and extracted helper paths.

Validation

• cargo fmt --all: passed.
• cargo test test_validate_tool_schema_nested_path_uses_child: passed.
• coderabbit review --agent: passed with 0 findings after one recoverable rate-limit retry.
• make all: passed, including 4,110 nextest tests and 5 GitHub tool tests.

Notes

• No public API changes are included.
• No feature parity status changed; this is an internal refactor only.

Summary by Sourcery

Enhancements:

• Extract helper functions to validate nested object schemas and array item schemas, simplifying control flow in property schema validation and maintaining current validation rules and error messages.

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[sourcery-ai]

Reviewer's Guide

Refactors property schema validation to use early returns and small helper functions for object and array types, simplifying control flow without changing validation behavior or public API.

Flow diagram for flattened validate_property_schema control flow

flowchart LR
    A[validate_property_schema] --> B{prop.type present?}
    B -- no --> C[return]
    B -- object --> D[validate_nested_object_schema]
    B -- array --> E[validate_array_items]
    D --> F[validate_tool_schema_at]

    subgraph ArrayValidation
      E --> G{items present?}
      G -- no --> H[push array property missing items]
      G -- yes --> I{is_object_type}
      I -- no --> J[return]
      I -- yes --> K[child items path]
      K --> L[validate_tool_schema_at]
    end

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File-Level Changes

Change	Details	Files
Flattened validate_property_schema control flow and delegated type-specific logic to helper functions.	Replaced nested conditional logic inside validate_property_schema with a match on the resolved type using an early return when type is absent. Delegated object-type property validation to a new helper that forwards to validate_tool_schema_at. Delegated array-type property validation to a new helper that encapsulates item presence/type checks and nested schema validation.	src/tools/tool/schema_helpers.rs
Introduced dedicated helpers for nested object and array item schema validation.	Added validate_nested_object_schema helper to wrap validate_tool_schema_at for object properties using the computed property path. Added validate_array_items helper that validates presence of items, checks that items is an object type via is_object_type, and then validates the nested schema at items path. Replaced inline array items validation logic with calls to the new helpers, preserving existing error messages for missing items and overall behavior.	src/tools/tool/schema_helpers.rs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#36	Reduce the nesting depth of validate_property_schema below the threshold by flattening control flow using guard clauses and helper functions, without changing its externally visible behavior.	✅
#36	Preserve existing behavior, validation rules, and error strings (including for array items and nested object validation) while refactoring.	✅
#36	Avoid public API changes to validate_property_schema and keep the module’s external interface intact while ensuring tests continue to pass.	✅

Possibly linked issues

• Deep, Nested Complexity: refactor validate_property_schema in src/tools/tool/schema_helpers.rs #36: PR implements the requested validate_property_schema refactor: flattening nested branching into helpers while preserving behavior and errors.

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