feat: add vision-synthesizer and vision-condenser agents

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Summary

After questioning, spawn vision-synthesizer to produce Vision Brief JSON (using B1 schema). User reviews and can request revision loops. Then spawn vision-condenser to produce the gsd:new-project handoff document.

Agents

• vision-synthesizer: reads vision-draft.md + vision-research.json → writes .mgw/vision-brief.json
• vision-condenser: reads vision-brief.json → writes .mgw/vision-handoff.md (structured context for gsd:new-project)

Review Loop

• Present Vision Brief to user
• Options: Accept / Revise section / Dig deeper on X
• Revisions loop back to vision-synthesizer with correction context
• Accept proceeds to condense

Files

• commands/project.md — add vision_synthesis step (synthesizer + review loop) and vision_condense step

GSD Route

gsd:quick

Depends On

• B3 (vision-draft.md must exist)
• B1 (schema must be defined)

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MGW execution-complete · 2026-03-01T00:00:00Z
Milestone: v3 — Vision Collaboration Cycle | Phase 23: Vision Synthesis & Handoff

Implementation Complete

Implemented in commit 6ef9706 on branch feat/mgw-gsd-architecture-repair.

Added vision_synthesis and vision_condense steps to commands/project.md:

• vision_synthesis: spawns vision-synthesizer agent to produce a structured .mgw/vision-brief.json conforming to the Vision Brief schema, then enters an accept/revise/dig-deeper review loop
• vision_condense: spawns vision-condenser agent that distills the brief into a .mgw/vision-handoff.md optimized for GSD agent consumption

Part of PR #102.