refactor: migrate agents to path-based context loading

- Update action-planning-agent and task-generate-agent to load context
  via file paths instead of embedded context packages
- Streamline test-cycle-execute workflow execution
- Remove redundant content from conflict-resolution and context-gather
- Update SKILL.md and tdd-plan documentation

.claude/skills/command-guide/reference/commands/workflow/tdd-plan.md

@@ -417,52 +417,6 @@ Convert user input to TDD-structured format:
 - **Command failure**: Keep phase in_progress, report error
 - **TDD validation failure**: Report incomplete chains or wrong dependencies
 
-## TDD Workflow Enhancements
-
-### Overview
-The TDD workflow has been significantly enhanced by integrating best practices from both traditional `plan --agent` and `test-gen` workflows, creating a hybrid approach that bridges the gap between idealized TDD and real-world development complexity.
-
-### Key Improvements
-
-#### 1. Test Coverage Analysis (Phase 3)
-**Adopted from test-gen workflow**
-
-Before planning TDD tasks, the workflow now analyzes the existing codebase:
-- Detects existing test patterns and conventions
-- Identifies current test coverage
-- Discovers related components and integration points
-- Detects test framework automatically
-
-**Benefits**:
-- Context-aware TDD planning
-- Avoids duplicate test creation
-- Enables integration with existing tests
-- No longer assumes greenfield scenarios
-
-#### 2. Iterative Green Phase with Test-Fix Cycle
-**Adopted from test-gen workflow**
-
-IMPL (Green phase) tasks now include automatic test-fix cycle for resilient implementation:
-
-**Enhanced IMPL Task Flow**:
-```
-1. Write minimal implementation code
-2. Execute test suite
-3. IF tests pass → Complete task
-4. IF tests fail → Enter fix cycle:
-   a. Gemini diagnoses with bug-fix template
-   b. Apply fix (manual or Codex)
-   c. Retest
-   d. Repeat (max 3 iterations)
-5. IF max iterations → Auto-revert changes 🔄
-```
-
-**Benefits**:
-- Faster feedback within Green phase
-- Autonomous recovery from implementation errors
-- Systematic debugging with Gemini
-- Safe rollback prevents broken state
-
 #### 3. Agent-Driven Planning
 **From plan --agent workflow**