refactor: start design recipes from codebase analysis instead of requirement-analyzer

[shinpr]

Summary

recipe-design and recipe-front-design previously began with requirement-analyzer, organizing requirements from the user query alone before any code was inspected. In the design phase, a thin query-only requirements pass that misses the mark creates uncertainty and rework. Both recipes now enter design from a scope grounded in real code.

What changed

Design-phase entry (recipe-design, recipe-front-design)

• Removed the requirement-analyzer call at the start of both design recipes.
• Added a recipe-local scope bootstrap (Step 1): the orchestrator extracts keywords from the user requirements, locates seed files with rg/grep, and builds the requirement_analysis seed that codebase-analyzer requires. Empty results fall back to asking the user; overly broad results (>~20 files) are narrowed with the user before proceeding.
• codebase-analyzer now runs first, with its existing schema unchanged.
• Added a recipe-local scope confirmation step after codebase-analyzer: the user reviews target files/modules, affected layers, unknowns, and open questions, then chooses to proceed / correct the scope / hear more / produce an ADR.
• Narrowed each recipe's dependency on subagents-orchestration-guide to orchestration principles, the Scale Determination table, and handoff contracts HC-02 onward. The recipes now define their own start order and inline all subagent prompts (including HC-04: document-reviewer receives codebase_analysis, plus ui_analysis for the frontend recipe).

Out of scope (unchanged)

• requirement-analyzer, codebase-analyzer, subagents-orchestration-guide, and the implement recipes. recipe-implement / recipe-fullstack-implement still start with requirement-analyzer.
• No agent schema or handoff-contract changes; no new global orchestration concept.

Release

• Bumped the four local plugins and package.json to 0.19.3.

Validation

• claude plugin validate — marketplace manifest + all four plugins pass
• npm run sync:check — generated plugin copies in sync
• npm run check:skills-index — all skills consistent

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