docs: conform spec to required template

docs/specs/DEVX-163.md

@@ -8,15 +8,31 @@ sso-bridge have them; grm gained them under GRM-171).
 `devx-workflow` documents `make create-task -- --title`, which fails
 because `devx-create-task` forwards no arguments.
 
-## Requirements
+## Approach
 
-- REQ-1: Add `vikunja-tasks` skill: create via module call, query,
+REQ-1: Add `vikunja-tasks` skill: create via module call, query,
   close, spec-collision convention, unreachable-tracker handling.
-- REQ-2: Add `tests/unit/test_skills_validation.py` covering
+REQ-2: Add `tests/unit/test_skills_validation.py` covering
   structure, make-target, file-ref checks + existence tests for all
   skills.
-- REQ-3: Fix broken `make create-task -- --title` documentation in
-  `devx-workflow` skill.
+REQ-3: Fix broken `make create-task -- --title` documentation in
+  `devx-workflow` skill; add missing When to Invoke / Prerequisites
+  sections to older-format skills.
+
+Preserve the colliding spec as
+[DEVX-163-run-push-stdout-historical](DEVX-163-run-push-stdout-historical.md).
+
+## Test Plan
+
+- `pytest tests/unit/test_skills_validation.py` passes (10 tests).
+
+## Deploy Plan
+
+Documentation/skills only — auto-merge to master; no runtime deploy.
+
+## Rollback Plan
+
+Revert the squash-merge commit; skills are inert documentation.
 
 ## Acceptance Criteria