skills: add create-v2mom; extend add-tests with refactor-for-testabilityHEADmain

New standalone create-v2mom skill (converted from the homelab
workflow template, markdown + YAML frontmatter, context-hygiene
references removed in favor of the global session-context protocol).

add-tests/SKILL.md gains a 'Core Principle — Refactor for Testability
First' section and three inserts into the phase instructions:
- Phase 1 flags testability-blocked functions during inventory
- Phase 2 surfaces refactor-first candidates per function
- Phase 3 adds a test-failure-vs-production-bug triage step

Sourced from the retired refactor.org homelab workflow (which was a
TDD-for-testability guide, not a general refactoring guide — general
refactoring is already covered by the /refactor slash command).

1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 1e9a1e8..0c26ea8 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ SKILLS     := c4-analyze c4-diagram debug add-tests respond-to-review review-cod
               arch-design arch-decide arch-document arch-evaluate \
               brainstorm codify root-cause-trace five-whys prompt-engineering \
               playwright-js playwright-py frontend-design pairwise-tests \
-              finish-branch
+              finish-branch create-v2mom
 RULES      := $(wildcard claude-rules/*.md)
 HOOKS      := $(wildcard hooks/*.sh hooks/*.py)
 LANGUAGES  := $(notdir $(wildcard languages/*))