Enhance .cursor documentation and workflows

Updated the README.md to reflect new skill commands and improved descriptions for various workflows, including the addition of new skills like /test-spec, /code-review, and /release. Enhanced clarity on session boundaries and flow resolutions in the auto-chaining process.

Removed the implementer agent file as it is no longer needed. Updated coderule and meta-rule documents to enforce stricter testing and implementation standards, ensuring real results are produced rather than simulated ones.

Revised the autodev flow documentation to include a new release step and clarified the retrospective process. Adjusted the testing rules to specify coverage thresholds for critical paths.

Co-authored-by: Cursor <cursoragent@cursor.com>

.cursor/skills/test-spec/SKILL.md

@@ -202,12 +202,12 @@ If invoked in `cycle-update` mode (see "Invocation Modes" above), read and follo
 | Missing acceptance_criteria.md, restrictions.md, or input_data/ | **STOP** — specification cannot proceed |
 | Missing input_data/expected_results/results_report.md | **STOP** — ask user to provide expected results mapping using the template |
 | Ambiguous requirements | ASK user |
-| Input data coverage below 75% (Phase 1) | Search internet for supplementary data, ASK user to validate |
+| Input data coverage below the canonical threshold (Phase 1) | Search internet for supplementary data, ASK user to validate. See `.cursor/rules/cursor-meta.mdc` Quality Thresholds for the canonical 75% number — do not hardcode a different threshold here. |
 | Expected results missing or not quantifiable (Phase 1) | ASK user to provide quantifiable expected results before proceeding |
 | Test scenario conflicts with restrictions | ASK user to clarify intent |
 | System interfaces unclear (no architecture.md) | ASK user or derive from solution.md |
 | Test data or expected result not provided for a test scenario (Phase 3) | WARN user and REMOVE the test |
-| Final coverage below 75% after removals (Phase 3) | BLOCK — require user to supply data or accept reduced spec |
+| Final coverage below the canonical threshold after removals (Phase 3) | BLOCK — require user to supply data or accept reduced spec (see `cursor-meta.mdc` Quality Thresholds) |
 
 ## Common Mistakes
 
@@ -252,7 +252,8 @@ When the user wants to:
 │                                                                      │
 │ Phase 3: Test Data & Expected Results Validation Gate (HARD GATE)    │
 │   → phases/03-data-validation-gate.md                                │
-│   [BLOCKING: coverage ≥ 75% required to pass]                        │
+│   [BLOCKING: coverage ≥ canonical threshold required to pass —      │
+│    see cursor-meta.mdc Quality Thresholds (75%)]                    │
 │                                                                      │
 │ Hardware-Dependency Assessment (BLOCKING, pre-Phase-4)               │
 │   → phases/hardware-assessment.md                                    │

.cursor/skills/test-spec/phases/03-data-validation-gate.md

@@ -1,7 +1,7 @@
 # Phase 3: Test Data & Expected Results Validation Gate (HARD GATE)
 
 **Role**: Professional Quality Assurance Engineer
-**Goal**: Ensure every test scenario produced in Phase 2 has concrete, sufficient test data. Remove tests that lack data. Verify final coverage stays above 75%.
+**Goal**: Ensure every test scenario produced in Phase 2 has concrete, sufficient test data. Remove tests that lack data. Verify final coverage stays above the canonical threshold (currently 75% — see `.cursor/rules/cursor-meta.mdc` Quality Thresholds; never hardcode a different number in any phase).
 **Constraints**: This phase is MANDATORY and cannot be skipped.
 
 ## Step 1 — Build the requirements checklist