refactor: extract vision-cycle workflow from project.md (#136)

[snipcodeit]

Summary

• Extracted the 6-stage Vision Collaboration Cycle (~488 lines) from commands/project.md into a new standalone file workflows/vision-cycle.md
• The Fresh routing branch in project.md now references @workflows/vision-cycle.md via a 5-line vision_cycle step, replacing the previously inlined steps
• vision-cycle.md is self-contained with a Precondition header (STATE_CLASS = Fresh), a Context Strategy section (rolling summary, agents receive Vision Brief + latest delta), and a Postcondition section documenting exit state

Closes #136

Milestone Context

• Milestone: v3.5 — Foundation Hardening
• Phase: 33 — project.md Decomposition
• Issue: 4 of 9 in milestone

Changes

File	Change	Lines
workflows/vision-cycle.md	Created — all 6 vision cycle steps extracted here	+514
commands/project.md	Removed 6 inline vision steps, replaced with @workflows/vision-cycle.md reference	-484 / +33
Net project.md reduction	1801 → 1320 lines	-481

The extracted steps in vision-cycle.md: vision_intake, vision_research, vision_questioning, vision_synthesis, vision_condense, spawn_gsd_new_project.

Test Plan

• Verify workflows/vision-cycle.md exists and contains all 6 steps: vision_intake, vision_research, vision_questioning, vision_synthesis, vision_condense, spawn_gsd_new_project
• Verify workflows/vision-cycle.md has Precondition (STATE_CLASS = Fresh), Context Strategy (rolling summary), and Postcondition sections
• Verify commands/project.md line count is 1320 (reduced from 1801, net -481 lines)
• Verify commands/project.md contains <step name="vision_cycle"> with @workflows/vision-cycle.md reference in the Fresh routing section (around line 253)
• Verify commands/project.md no longer contains any of the inline <step name="vision_intake">, <step name="vision_research">, etc. blocks
• Confirm the rolling context strategy note ("agents receive Vision Brief + latest delta, never full transcript") is preserved in vision-cycle.md

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