Add lite mode for fewer intermediate checks

[shinpr]

Summary

• Add lite mode. When the user asks for it in any recipe request, the orchestrator skips code-verifier, design-sync, and security-reviewer, and runs the quality fixer once after the last Work Plan task instead of before every commit. Phases, approval stops, code review, and quality checks on review fixes stay the same.
• Keep the rules in subagents-orchestration-guide/references/lite-mode.md, read only when the user asks. Recipes are unchanged.
• Record task and Work Plan progress after the implementation commit. The extra "after quality pass" condition was redundant, since a commit already requires it in the default flow.
• Rework the READMEs around adopting and running the workflow: add lite mode, and remove the scale table, template excerpts, agent list, and installed layout.
• Bump the minor version to 1.6.0.

Validation

• $recipe-design and $recipe-build in lite mode with codex exec on a small fixture repo. Design: no code-verifier or design-sync (with two Design Docs present), and the approval stop came right after document review. Build: two task commits without a per-task quality fixer, one final quality-fixer run (lint and 13 tests passed), code-reviewer only, and both Work Plan tasks checked off.
• npm test

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