Auto-update board Status field on pipeline_stage transitions

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Description

Whenever MGW writes a new pipeline_stage to .mgw/active/.json, also update the corresponding board item Status field via GitHub Projects v2 GraphQL mutation updateProjectV2ItemFieldValue. Map pipeline stages to board status options: new→Backlog, triaged→Ready, planning/executing→In Progress, verifying→Review, pr-created/done→Done, blocked→Blocked. Implement as a shared function in lib/board.cjs callable by all pipeline-stage-writing commands.

Acceptance Criteria

• Auto-update board Status field on pipeline_stage transitions

GSD Route

plan-phase

Phase Context

Phase 2: Pipeline State Sync of v2 — GitHub Projects Board Management

Depends on

design-and-scaffold-github-projects-v2-board-wi

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MGW · work-started · 2026-03-01T05:13:42Z
Milestone: v2 — GitHub Projects Board Management | Phase 14: Pipeline State Sync

Work Started

Issue	#74 — Auto-update board Status field on pipeline_stage transitions
Route	plan-phase
Phase	14 of 15 — Pipeline State Sync
Milestone	v2 — GitHub Projects Board Management

Milestone Progress (3/9 complete)

#	Issue	Status	PR
71	Design and scaffold GitHub Projects v2 board	✓ Done	#86
72	Add mgw:board command	✓ Done	#87
73	Sync project.json milestones into board items	✓ Done	#88
74	Auto-update board Status field	◆ In Progress	—
75	Surface AI Agent State field	○ Pending	—
76	Sync linked PRs and branches onto board items	○ Pending	—
77	Configure Board layout	○ Pending	—
78	Configure Table layout	○ Pending	—
79	Configure Roadmap layout	○ Pending	—

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MGW · pr-ready · 2026-03-01T05:21:25Z
Milestone: v2 — GitHub Projects Board Management | Phase 14: Pipeline State Sync

PR Ready

PR #89 — #89

Closes #74. Auto-closes when merged.

Milestone Progress (4/9 complete)

#	Issue	Status	PR
71	Design and scaffold GitHub Projects v2 board	✓ Done	#86
72	Add mgw:board command	✓ Done	#87
73	Sync project.json milestones into board items	✓ Done	#88
74	Auto-update board Status field	✓ Done	#89
75	Surface AI Agent State field	○ Pending	—
76	Sync linked PRs and branches onto board items	○ Pending	—
77	Configure Board layout	○ Pending	—
78	Configure Table layout	○ Pending	—
79	Configure Roadmap layout	○ Pending	—