- Add vikunja-tasks: task create/query/close lifecycle - New tests/unit/test_skills_validation.py: structure, make-target, file-ref checks + existence tests for all 8 skills; devx.mak targets resolved from src/devx/make/ (editable install) - devx-workflow/spec-driven-development/testing-and-debugging: add When to Invoke + Prerequisites; fix broken create-task syntax - Preserve colliding spec as DEVX-163-run-push-stdout-historical Implements: REQ-1 REQ-2 REQ-3
