feat(ultraplan-local): add /ultra-skill-author-local command
Channel 2 of skill-factory: manual one-source-at-a-time generator for
cc-architect-catalog. Validates source (.md/.txt, < 200 KB), launches
skill-author-orchestrator (opus), presents verdict summary with
context-specific next-step guidance.
Modes: default (full pipeline), --fg (alias, no-op), --quick (skip
IP-hygiene with BIG WARNING). Foreground-only in fase-1.
Plan: .claude/projects/2026-04-18-skill-factory-fase-1-mvp/plan.md (step 10)
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