Refactor task management structure and update documentation

- Changed the directory structure for task specifications to include a dedicated `todo/` folder within `_docs/02_tasks/` for tasks ready for implementation.
- Updated references in various skills and documentation to reflect the new task lifecycle, including changes in the `implementer` and `decompose` skills.
- Enhanced the README and flow documentation to clarify the new task organization and its implications for the implementation process.

These updates improve task management clarity and streamline the implementation workflow.

.cursor/skills/autopilot/flows/existing-code.md

@@ -68,7 +68,7 @@ Action: Analyze the codebase against the test specs to determine whether the cod
      - **Source**: `autopilot-testability-analysis`
      - One change entry per testability issue found (change ID, file paths, problem, proposed change, risk, dependencies)
    - Invoke the refactor skill in **guided mode**: read and execute `.cursor/skills/refactor/SKILL.md` with the `list-of-changes.md` as input
-   - The refactor skill will create RUN_DIR (`01-testability-refactoring`), create tasks in `_docs/02_tasks/`, delegate to implement skill, and verify results
+   - The refactor skill will create RUN_DIR (`01-testability-refactoring`), create tasks in `_docs/02_tasks/todo/`, delegate to implement skill, and verify results
    - Phase 3 (Safety Net) is automatically skipped by the refactor skill for testability runs
    - After refactoring completes, mark Step 3 as `completed`
    - Auto-chain to Step 4 (Decompose Tests)
@@ -76,23 +76,23 @@ Action: Analyze the codebase against the test specs to determine whether the cod
 ---
 
 **Step 4 — Decompose Tests**
-Condition: `_docs/02_document/tests/traceability-matrix.md` exists AND workspace contains source code files AND the autopilot state shows Step 3 (Code Testability Revision) is completed or skipped AND (`_docs/02_tasks/` does not exist or has no test task files)
+Condition: `_docs/02_document/tests/traceability-matrix.md` exists AND workspace contains source code files AND the autopilot state shows Step 3 (Code Testability Revision) is completed or skipped AND (`_docs/02_tasks/todo/` does not exist or has no test task files)
 
 Action: Read and execute `.cursor/skills/decompose/SKILL.md` in **tests-only mode** (pass `_docs/02_document/tests/` as input). The decompose skill will:
 1. Run Step 1t (test infrastructure bootstrap)
 2. Run Step 3 (blackbox test task decomposition)
 3. Run Step 4 (cross-verification against test coverage)
 
-If `_docs/02_tasks/` has some task files already (e.g., refactoring tasks from Step 3), the decompose skill's resumability handles it — it appends test tasks alongside existing refactoring tasks.
+If `_docs/02_tasks/` subfolders have some task files already (e.g., refactoring tasks from Step 3), the decompose skill's resumability handles it — it appends test tasks alongside existing tasks.
 
 ---
 
 **Step 5 — Implement Tests**
-Condition: `_docs/02_tasks/` contains task files AND `_dependencies_table.md` exists AND the autopilot state shows Step 4 (Decompose Tests) is completed AND `_docs/03_implementation/FINAL_implementation_report.md` does not exist
+Condition: `_docs/02_tasks/todo/` contains task files AND `_dependencies_table.md` exists AND the autopilot state shows Step 4 (Decompose Tests) is completed AND `_docs/03_implementation/FINAL_implementation_report.md` does not exist
 
 Action: Read and execute `.cursor/skills/implement/SKILL.md`
 
-The implement skill reads test tasks from `_docs/02_tasks/` and implements them.
+The implement skill reads test tasks from `_docs/02_tasks/todo/` and implements them.
 
 If `_docs/03_implementation/` has batch reports, the implement skill detects completed tasks and continues.
 
@@ -135,7 +135,7 @@ Condition: the autopilot state shows Step 7 (Refactor) is completed or skipped A
 
 Action: Read and execute `.cursor/skills/new-task/SKILL.md`
 
-The new-task skill interactively guides the user through defining new functionality. It loops until the user is done adding tasks. New task files are written to `_docs/02_tasks/`.
+The new-task skill interactively guides the user through defining new functionality. It loops until the user is done adding tasks. New task files are written to `_docs/02_tasks/todo/`.
 
 ---
 
@@ -144,7 +144,7 @@ Condition: the autopilot state shows Step 8 (New Task) is completed AND `_docs/0
 
 Action: Read and execute `.cursor/skills/implement/SKILL.md`
 
-The implement skill reads the new tasks from `_docs/02_tasks/` and implements them. Tasks already implemented in Step 5 are skipped (the implement skill tracks completed tasks in batch reports).
+The implement skill reads the new tasks from `_docs/02_tasks/todo/` and implements them. Tasks already implemented in Step 5 are skipped (completed tasks have been moved to `done/`).
 
 If `_docs/03_implementation/` has batch reports from this phase, the implement skill detects completed tasks and continues.
 

.cursor/skills/autopilot/flows/greenfield.md

@@ -110,16 +110,16 @@ If the project IS a UI project → present using Choose format:
 ---
 
 **Step 5 — Decompose**
-Condition: `_docs/02_document/` contains `architecture.md` AND `_docs/02_document/components/` has at least one component AND `_docs/02_tasks/` does not exist or has no task files (excluding `_dependencies_table.md`)
+Condition: `_docs/02_document/` contains `architecture.md` AND `_docs/02_document/components/` has at least one component AND `_docs/02_tasks/todo/` does not exist or has no task files
 
 Action: Read and execute `.cursor/skills/decompose/SKILL.md`
 
-If `_docs/02_tasks/` has some task files already, the decompose skill's resumability handles it.
+If `_docs/02_tasks/` subfolders have some task files already, the decompose skill's resumability handles it.
 
 ---
 
 **Step 6 — Implement**
-Condition: `_docs/02_tasks/` contains task files AND `_dependencies_table.md` exists AND `_docs/03_implementation/FINAL_implementation_report.md` does not exist
+Condition: `_docs/02_tasks/todo/` contains task files AND `_dependencies_table.md` exists AND `_docs/03_implementation/FINAL_implementation_report.md` does not exist
 
 Action: Read and execute `.cursor/skills/implement/SKILL.md`