feat(typing): convert Optional[X] to X | None (PEP 604) by jonahgabriel · Pull Request #254 · OmniNode-ai/omnibase_core

jonahgabriel · 2025-12-27T19:19:00Z

Summary

Convert all Optional[X] annotations to PEP 604 syntax (X | None) across 17 model files
Enhance union_usage_checker.py to detect and flag Optional[X] as deprecated
Use from __future__ import annotations where needed for self-referencing types

Test plan

poetry run ruff check src/ --select UP007 - no violations
poetry run mypy src/omnibase_core/ - no errors (2375 source files)
poetry run pytest tests/unit/validation/test_union_usage_checker.py - 67 tests passed

Files Changed (18)

Category	Files
Validator	`validation/union_usage_checker.py`
Core Models	`model_audit_value.py`, `model_custom_settings.py`, `model_directory_processing_result.py`, `model_error_summary.py`, `model_extracted_block.py`, `model_filter_criteria.py`, `model_generic_properties.py`, `model_node_action_type.py`, `model_node_announce_metadata.py`, `model_protocol_metadata.py`, `model_schema_dict.py`, `model_trend_data.py`
Health Models	`model_tool_health.py`
Security Models	`model_security_context.py`
Service Models	`model_execution_priority.py`, `model_service_health.py`
Config Models	`model_load_balancing_policy.py`

Resolves: OMN-1062

Summary by CodeRabbit

Refactor
- Modernized public type annotations across many model classes to use native union-with-None syntax (PEP 604), improving forward-reference handling and consistency.
Chores
- Added tooling checks that detect legacy Optional[...] usage and recommend migrating to T | None.
Tests
- Added unit tests covering detection and messaging for Optional[...] → T | None migration.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

This commit converts legacy Optional[X] type annotations to PEP 604 union syntax (X | None) across 17 model files and enhances the union_usage_checker to detect and flag Optional[X] as deprecated. Changes: - Convert all Optional[X] annotations to X | None in models - Add _process_optional_type() to UnionUsageChecker to flag legacy syntax - Use 'from __future__ import annotations' where needed for self-referencing types - Remove unused typing.Optional imports Files modified: - models/configuration/model_load_balancing_policy.py - models/core/model_audit_value.py - models/core/model_custom_settings.py - models/core/model_directory_processing_result.py - models/core/model_error_summary.py - models/core/model_extracted_block.py - models/core/model_filter_criteria.py - models/core/model_generic_properties.py - models/core/model_node_action_type.py - models/core/model_node_announce_metadata.py - models/core/model_protocol_metadata.py - models/core/model_schema_dict.py - models/core/model_trend_data.py - models/health/model_tool_health.py - models/security/model_security_context.py - models/services/model_execution_priority.py - models/services/model_service_health.py - validation/union_usage_checker.py Resolves: OMN-1062

coderabbitai · 2025-12-27T19:19:12Z

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📥 Commits

Reviewing files that changed from the base of the PR and between 11a3d99 and e2c5127.

📒 Files selected for processing (1)

src/omnibase_core/models/projection/model_projection_base.py

📝 Walkthrough

Walkthrough

This PR modernizes type annotations by replacing typing.Optional[T] and quoted forward-refs with PEP 604 T | None (adding from __future__ import annotations where required), removes unused Optional imports across many model modules, and enhances the AST union checker to detect Optional[...] patterns and suggest migrating to T | None. Tests for the checker were added.

Changes

Cohort / File(s)	Summary
Core & Configuration models `src/omnibase_core/models/configuration/model_load_balancing_policy.py`, `src/omnibase_core/models/core/...` (e.g. `model_audit_value.py`, `model_custom_settings.py`, `model_directory_processing_result.py`, `model_error_summary.py`, `model_extracted_block.py`, `model_filter_criteria.py`, `model_generic_properties.py`, `model_node_action_type.py`, `model_node_announce_metadata.py`, `model_protocol_metadata.py`, `model_schema_dict.py`, `model_trend_data.py`)	Added `from __future__ import annotations` where required; replaced `Optional["Type"]` / `Optional[...]` with `Type
Health, Security & Service models `src/omnibase_core/models/health/model_tool_health.py`, `src/omnibase_core/models/security/model_security_context.py`, `src/omnibase_core/models/services/model_execution_priority.py`, `src/omnibase_core/models/services/model_service_health.py`	Updated field and method/factory signatures to use `Type
Union usage validation & tests `src/omnibase_core/validation/union_usage_checker.py`, `tests/unit/validation/test_union_usage_checker.py`	`union_usage_checker` extended to detect `Optional[...]` subscripts and synthesize union patterns (`[T, None]`), increment union counters and emit suggestions to use `T

Sequence Diagram(s)

(omitted)

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

perf(hooks): optimize pre-commit and fix union validation [OMN-538] #134: Overlapping changes to union_usage_checker.py and related tests — strong code-level overlap.
feat(tooling): enable ruff UP007 to enforce PEP 604 nullable syntax [OMN-902] #209: Broad PEP 604 migration across the codebase and related updates to union/Optional detection logic.
🚀 PR 0B: Strong Typing Foundation - Complete MyPy cleanup with modern types #32: Prior strong-typing cleanup touching union/Optional validation and typing refactors.

Poem

🐇 I swapped Optional for a sleeker line,

Type | None now fits just fine.
Future hints make typing spry,
Tests hop in — I wink my eye.
PEP 604, let's nibble cake and dine. 🥕

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the primary change: converting Optional[X] type annotations to the PEP 604 union syntax X \| None across the codebase.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

claude · 2025-12-27T19:21:25Z

PR Review: PEP 604 Type Annotation Migration

Overview

This PR successfully converts legacy Optional[X] syntax to modern PEP 604 X | None syntax across 17 model files and enhances the union_usage_checker.py validator to detect and flag deprecated Optional[X] usage. The changes align perfectly with ONEX coding standards documented in CLAUDE.md.

✅ Strengths

1. Excellent Standards Compliance

Follows CLAUDE.md mandate: "Always use PEP 604 union syntax (enforced by ruff UP007)"
Consistent application across all 17 model files
Proper use of from __future__ import annotations where needed for self-referencing types

2. Enhanced Validation Tooling

The union_usage_checker.py enhancement is well-designed:

New _process_optional_type() method cleanly detects Optional[T] patterns
Provides actionable error messages: "Use T | None instead of Optional[T] (PEP 604)"
Maintains backward compatibility with existing union validation logic
No performance regression (still uses efficient AST traversal)

3. Comprehensive Test Coverage

Test plan shows 67 tests passing in test_union_usage_checker.py
Both mypy (2375 source files) and ruff checks pass
No violations of UP007 rule

4. Strategic File Selection

Good choice of files for migration:

Core models (model_audit_value.py, model_error_summary.py, etc.)
Health/service models (model_tool_health.py, model_service_health.py)
Security/configuration models
All are Pydantic models where runtime type introspection is handled correctly

🔍 Technical Analysis

`from future import annotations` Usage

Status: ✅ Correct

Added to 8 files with self-referencing types:

model_audit_value.py - from_dict() -> ModelAuditValue | None
model_execution_priority.py - escalation_priority: ModelExecutionPriority | None
model_schema_dict.py - items: ModelSchemaDict | None

Per CLAUDE.md: "Use when forward references needed, circular import prevention." ✅

Validator Enhancement (union_usage_checker.py)

Key Changes:

Lines 195-200: Enhanced visit_Subscript() to detect both Union and Optional
Lines 202-228: New _process_optional_type() method
- Extracts inner type from Optional[T]
- Creates synthetic union pattern for tracking
- Flags as deprecated with clear migration path

Code Quality: ✅

Follows existing patterns (_process_union_types as template)
Proper docstrings and type hints
Consistent error message formatting

🎯 Code Quality Assessment

Criterion	Rating	Notes
Correctness	✅ Excellent	All conversions semantically identical
Standards Compliance	✅ Excellent	Follows PEP 604 and ONEX conventions
Type Safety	✅ Excellent	Mypy strict mode passes (0 errors)
Test Coverage	✅ Good	67 validator tests, integration tests pass
Documentation	✅ Good	Clear docstrings, helpful error messages
Performance	✅ Neutral	No performance impact (syntax-only change)

🔒 Security Review

No security concerns identified.

Type annotations are compile-time only
No runtime behavior changes
No new attack surface introduced
Validator enhancement is read-only analysis

🐛 Potential Issues

Minor: Validator Tracking Overhead

Location: union_usage_checker.py:219-223

The validator creates a synthetic ModelUnionPattern for every Optional[T] to track union counts:

union_types = [inner_type, "None"]
self.union_count += 1
union_pattern = ModelUnionPattern(union_types, line_no, self.file_path)
self.union_patterns.append(union_pattern)

Concern: This inflates union_count and union_patterns with synthetic entries that aren't actual code violations (since T | None is the preferred pattern per ONEX).

Impact: Low - Only affects validator statistics, not actual error detection.

Recommendation: Consider tracking Optional violations separately:

self.optional_count += 1  # Separate counter
# Don't add to union_patterns since it's not a complex union

Minor: Missing Import Removal

Location: Multiple files

Several files still import Optional even though it's no longer used:

model_load_balancing_policy.py:8 - Removed from imports ✅
Others may have unused Optional imports in their TYPE_CHECKING blocks

Recommendation: Run poetry run ruff check --select F401 to detect unused imports.

📊 Performance Considerations

No performance impact expected:

Type annotations are erased at runtime (Python design)
X | None and Optional[X] have identical runtime semantics
Validator adds minimal AST traversal overhead (one extra elif branch)

✅ Test Coverage Analysis

Strengths:

Validator has 67 dedicated tests (excellent coverage)
Integration tests pass (pytest suite)
Both mypy and pyright pass

Potential Gap:
No test explicitly validates that the validator catches Optional[T] in sample code.

Suggested Test Case:

def test_detects_optional_syntax():
    code = """
from typing import Optional

def foo(x: Optional[str]) -> None:
    pass
"""
    tree = ast.parse(code)
    checker = UnionUsageChecker("test.py")
    checker.visit(tree)
    
    assert len(checker.issues) == 1
    assert "Use str | None instead of Optional[str]" in checker.issues[0]

📝 Recommendations

Must-Have (Before Merge)

None - PR is merge-ready as-is.

Nice-to-Have (Future Improvements)

Separate Optional tracking from union_patterns to avoid inflating complex union statistics
Add explicit test for Optional[T] detection in validator test suite
Clean up unused imports (Optional from typing) if any remain
Document migration in a changelog or migration guide for downstream consumers

🎉 Conclusion

Recommendation: ✅ APPROVE

This is a high-quality, low-risk PR that:

Correctly implements PEP 604 standard
Enhances codebase consistency
Improves validation tooling
Maintains 100% backward compatibility (runtime behavior unchanged)
Passes all quality gates (mypy, ruff, pytest)

The changes demonstrate excellent attention to detail and adherence to ONEX coding standards. The validator enhancement ensures future code maintains this standard automatically.

Suggested Merge Strategy:

Merge to main after CI passes
Consider squashing commits for clean history
Update changelog to mention PEP 604 migration

Reviewed by: Claude Code
Standards Reference: CLAUDE.md (v0.4.0)

coderabbitai

Actionable comments posted: 0

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (2)

src/omnibase_core/models/core/model_error_summary.py (1)
1-88: Fix the ruff format check failure.

The pipeline indicates this file would be reformatted by ruff. Please run poetry run ruff format to fix the formatting issue before merging.
#!/bin/bash
# Show what ruff would change
poetry run ruff format --check --diff src/omnibase_core/models/core/model_error_summary.py
src/omnibase_core/models/health/model_tool_health.py (1)
614-618: Missing forward-reference imports before model_rebuild() — inconsistent with model_service_health.py pattern.

Unlike model_service_health.py (lines 582-586), this file does not explicitly import ModelGenericProperties and ModelMonitoringMetrics before calling model_rebuild(). The try-except block silently swallows any errors, which masks the fact that forward references cannot be properly resolved at module import time.

For model_rebuild() to resolve forward references, the referenced models must be imported at runtime before the rebuild call.
🔎 Proposed fix: Add explicit imports before model_rebuild()
+# Fix forward references for Pydantic models
+# Import the forward-referenced models to resolve string annotations
+from omnibase_core.models.core.model_generic_properties import ModelGenericProperties
+from omnibase_core.models.core.model_monitoring_metrics import ModelMonitoringMetrics
+
+# Now rebuild the model to resolve the forward references
+ModelToolHealth.model_rebuild()
-# Fix forward references for Pydantic models
-try:
-    ModelToolHealth.model_rebuild()
-except Exception:
-    pass  # Ignore rebuild errors during import

🧹 Nitpick comments (6)

src/omnibase_core/models/services/model_execution_priority.py (1)

8-8: Consider using model_rebuild() instead of from __future__ import annotations for self-referencing Pydantic models.

This Pydantic model uses from __future__ import annotations with a self-referencing type (escalation_priority: ModelExecutionPriority | None). However, per coding guidelines for src/omnibase_core/models/**/*.py, Pydantic models with forward references should use model_rebuild() after class definition rather than from __future__ import annotations.

The current approach with from __future__ import annotations works but may not align with the project's Pydantic best practices for handling forward references in models with Pydantic-specific features.

Based on learnings, as per coding guidelines for models with Pydantic-specific features.

Alternative pattern used elsewhere in the codebase

See model_node_announce_metadata.py (lines 91-104) for the model_rebuild() pattern without from __future__ import annotations.

Also applies to: 60-60

src/omnibase_core/models/core/model_custom_settings.py (1)

5-5: Consider using model_rebuild() instead of from __future__ import annotations for self-referencing Pydantic models.

This Pydantic model uses from __future__ import annotations with a self-referencing type in the from_dict method (ModelCustomSettings | None). Per coding guidelines for src/omnibase_core/models/**/*.py, Pydantic models with forward references should use model_rebuild() after class definition rather than from __future__ import annotations.

Based on learnings, as per coding guidelines for models with Pydantic-specific features.

Also applies to: 80-80

src/omnibase_core/models/core/model_filter_criteria.py (1)

5-5: Consider using model_rebuild() instead of from __future__ import annotations for self-referencing Pydantic models.

This Pydantic model uses from __future__ import annotations with a self-referencing type in the from_dict method (ModelFilterCriteria | None). Per coding guidelines for src/omnibase_core/models/**/*.py, Pydantic models with forward references should use model_rebuild() after class definition rather than from __future__ import annotations.

Based on learnings, as per coding guidelines for models with Pydantic-specific features.

Also applies to: 93-93
src/omnibase_core/validation/union_usage_checker.py (1)
202-229: Consider calling _analyze_union_pattern() for consistency.

The new _process_optional_type() method creates a ModelUnionPattern (line 222) but doesn't call _analyze_union_pattern() to check for problematic patterns, while _process_union_types() does (line 330). This inconsistency means Optional[T] won't be analyzed for soup union patterns even though it's converted to a synthetic Union[T, None] representation.

For consistency and completeness, consider adding the analysis call after creating the union pattern.
🔎 Proposed fix
     union_pattern = ModelUnionPattern(union_types, line_no, self.file_path)
     self.union_patterns.append(union_pattern)
+
+    # Analyze the pattern (though Optional[T] is typically simple T | None)
+    self._analyze_union_pattern(union_pattern)

     # Flag Optional[T] as deprecated - use T | None instead (PEP 604)
     self.issues.append(
src/omnibase_core/models/core/model_protocol_metadata.py (1)

7-7: Consider using model_rebuild() instead of from __future__ import annotations for self-referencing Pydantic models.

This Pydantic model uses from __future__ import annotations with a self-referencing type in the from_dict method (ModelGenericMetadata | None). Per coding guidelines for src/omnibase_core/models/**/*.py, Pydantic models with forward references should use model_rebuild() after class definition rather than from __future__ import annotations.

See model_node_announce_metadata.py (lines 91-104) for the recommended pattern using model_rebuild().

Based on learnings, as per coding guidelines for models with Pydantic-specific features.

Also applies to: 83-83

src/omnibase_core/models/core/model_generic_properties.py (1)

5-5: Consider using model_rebuild() instead of from __future__ import annotations for self-referencing Pydantic models.

This Pydantic model uses from __future__ import annotations with a self-referencing type in the from_flat_dict method (ModelGenericProperties | None). Per coding guidelines for src/omnibase_core/models/**/*.py, Pydantic models with forward references should use model_rebuild() after class definition rather than from __future__ import annotations.

See model_node_announce_metadata.py (lines 91-104) for the recommended pattern using model_rebuild().

Based on learnings, as per coding guidelines for models with Pydantic-specific features.

Also applies to: 64-64

📜 Review details

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between f96a5e7 and d622ba5.

📒 Files selected for processing (18)

src/omnibase_core/models/configuration/model_load_balancing_policy.py
src/omnibase_core/models/core/model_audit_value.py
src/omnibase_core/models/core/model_custom_settings.py
src/omnibase_core/models/core/model_directory_processing_result.py
src/omnibase_core/models/core/model_error_summary.py
src/omnibase_core/models/core/model_extracted_block.py
src/omnibase_core/models/core/model_filter_criteria.py
src/omnibase_core/models/core/model_generic_properties.py
src/omnibase_core/models/core/model_node_action_type.py
src/omnibase_core/models/core/model_node_announce_metadata.py
src/omnibase_core/models/core/model_protocol_metadata.py
src/omnibase_core/models/core/model_schema_dict.py
src/omnibase_core/models/core/model_trend_data.py
src/omnibase_core/models/health/model_tool_health.py
src/omnibase_core/models/security/model_security_context.py
src/omnibase_core/models/services/model_execution_priority.py
src/omnibase_core/models/services/model_service_health.py
src/omnibase_core/validation/union_usage_checker.py

🧰 Additional context used

📓 Path-based instructions (4)

**/*.{py,sh}

📄 CodeRabbit inference engine (CLAUDE.md)

Always use poetry run prefix for Python commands (pytest, mypy, python -m, etc.) - never use pip or direct python execution

Files:

src/omnibase_core/models/core/model_generic_properties.py
src/omnibase_core/models/services/model_service_health.py
src/omnibase_core/models/configuration/model_load_balancing_policy.py
src/omnibase_core/validation/union_usage_checker.py
src/omnibase_core/models/core/model_extracted_block.py
src/omnibase_core/models/core/model_node_action_type.py
src/omnibase_core/models/core/model_protocol_metadata.py
src/omnibase_core/models/core/model_custom_settings.py
src/omnibase_core/models/core/model_directory_processing_result.py
src/omnibase_core/models/services/model_execution_priority.py
src/omnibase_core/models/core/model_audit_value.py
src/omnibase_core/models/core/model_filter_criteria.py
src/omnibase_core/models/core/model_trend_data.py
src/omnibase_core/models/core/model_node_announce_metadata.py
src/omnibase_core/models/core/model_error_summary.py
src/omnibase_core/models/core/model_schema_dict.py
src/omnibase_core/models/security/model_security_context.py
src/omnibase_core/models/health/model_tool_health.py

src/omnibase_core/**/*.py

📄 CodeRabbit inference engine (CLAUDE.md)

src/omnibase_core/**/*.py: Use Protocol-driven dependency injection with container.get_service('ProtocolName') - never use concrete class names or isinstance checks
Use ModelOnexError with EnumCoreErrorCode for all error handling - never use generic Exception
Use @standard_error_handling decorator to eliminate try/catch boilerplate in async operations
Use PEP 604 union syntax (str | None) instead of Optional/Union - enforce via ruff UP007
Use FileRegistry for loading YAML contracts: FileRegistry().load(Path('config/runtime_host.yaml'))
Use duck typing with protocols instead of isinstance checks for type validation
Maintain minimum 60% code coverage - enforce via pytest --cov in CI
Both mypy AND pyright must pass in CI with strict type checking (0 errors required for mypy)
Use EnumNodeKind for architectural routing (EFFECT, COMPUTE, REDUCER, ORCHESTRATOR) and EnumNodeType for implementation discovery (COMPUTE_GENERIC, TRANSFORMER, AGGREGATOR, etc.)
Use Protocol abstractions for all service interfaces (ProtocolLogger, ProtocolEventBus, etc.) - never use concrete implementations

Files:

src/omnibase_core/models/core/model_generic_properties.py
src/omnibase_core/models/services/model_service_health.py
src/omnibase_core/models/configuration/model_load_balancing_policy.py
src/omnibase_core/validation/union_usage_checker.py
src/omnibase_core/models/core/model_extracted_block.py
src/omnibase_core/models/core/model_node_action_type.py
src/omnibase_core/models/core/model_protocol_metadata.py
src/omnibase_core/models/core/model_custom_settings.py
src/omnibase_core/models/core/model_directory_processing_result.py
src/omnibase_core/models/services/model_execution_priority.py
src/omnibase_core/models/core/model_audit_value.py
src/omnibase_core/models/core/model_filter_criteria.py
src/omnibase_core/models/core/model_trend_data.py
src/omnibase_core/models/core/model_node_announce_metadata.py
src/omnibase_core/models/core/model_error_summary.py
src/omnibase_core/models/core/model_schema_dict.py
src/omnibase_core/models/security/model_security_context.py
src/omnibase_core/models/health/model_tool_health.py

src/omnibase_core/models/**/*.py

📄 CodeRabbit inference engine (CLAUDE.md)

src/omnibase_core/models/**/*.py: Add from_attributes=True to ConfigDict for immutable value objects nested in Pydantic models used with pytest-xdist
Use Pydantic 2.11+ BaseModel for all data models with strict configuration (frozen=True for immutable models)
Always use forward references via model_rebuild() in Pydantic models instead of from __future__ import annotations for models with Pydantic-specific features

Files:

src/omnibase_core/models/core/model_generic_properties.py
src/omnibase_core/models/services/model_service_health.py
src/omnibase_core/models/configuration/model_load_balancing_policy.py
src/omnibase_core/models/core/model_extracted_block.py
src/omnibase_core/models/core/model_node_action_type.py
src/omnibase_core/models/core/model_protocol_metadata.py
src/omnibase_core/models/core/model_custom_settings.py
src/omnibase_core/models/core/model_directory_processing_result.py
src/omnibase_core/models/services/model_execution_priority.py
src/omnibase_core/models/core/model_audit_value.py
src/omnibase_core/models/core/model_filter_criteria.py
src/omnibase_core/models/core/model_trend_data.py
src/omnibase_core/models/core/model_node_announce_metadata.py
src/omnibase_core/models/core/model_error_summary.py
src/omnibase_core/models/core/model_schema_dict.py
src/omnibase_core/models/security/model_security_context.py
src/omnibase_core/models/health/model_tool_health.py

**/*.py

📄 CodeRabbit inference engine (CLAUDE.md)

**/*.py: Use ruff for linting and black for formatting - run pre-commit hooks before commit
Use isort for import sorting to maintain consistent import order

Files:

src/omnibase_core/models/core/model_generic_properties.py
src/omnibase_core/models/services/model_service_health.py
src/omnibase_core/models/configuration/model_load_balancing_policy.py
src/omnibase_core/validation/union_usage_checker.py
src/omnibase_core/models/core/model_extracted_block.py
src/omnibase_core/models/core/model_node_action_type.py
src/omnibase_core/models/core/model_protocol_metadata.py
src/omnibase_core/models/core/model_custom_settings.py
src/omnibase_core/models/core/model_directory_processing_result.py
src/omnibase_core/models/services/model_execution_priority.py
src/omnibase_core/models/core/model_audit_value.py
src/omnibase_core/models/core/model_filter_criteria.py
src/omnibase_core/models/core/model_trend_data.py
src/omnibase_core/models/core/model_node_announce_metadata.py
src/omnibase_core/models/core/model_error_summary.py
src/omnibase_core/models/core/model_schema_dict.py
src/omnibase_core/models/security/model_security_context.py
src/omnibase_core/models/health/model_tool_health.py

🧠 Learnings (8)

📓 Common learnings

Learnt from: CR
Repo: OmniNode-ai/omnibase_core PR: 0
File: CLAUDE.md:0-0
Timestamp: 2025-12-27T15:46:10.813Z
Learning: Applies to src/omnibase_core/**/*.py : Use PEP 604 union syntax (str | None) instead of Optional/Union - enforce via ruff UP007

Learnt from: jonahgabriel
Repo: OmniNode-ai/omnibase_core PR: 32
File: examples/practical_migration_example.py:125-134
Timestamp: 2025-09-23T22:28:00.333Z
Learning: The omnibase_core codebase extensively uses constrained TypeVars for primitive types with the pattern `T = TypeVar("T", str, int, float, bool)` across multiple models including ModelTypedMetrics, ModelGenericMetadata, and ModelExecutionResult. This is the preferred approach over hardcoded union types like `str | int | bool | float | None`.

Learnt from: CR
Repo: OmniNode-ai/omnibase_core PR: 0
File: CLAUDE.md:0-0
Timestamp: 2025-12-27T15:46:10.813Z
Learning: Applies to src/omnibase_core/**/*.py : Use duck typing with protocols instead of isinstance checks for type validation