Add interactive config wizard to mgw:init for first-time setup

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Description

Replace silent .mgw/config.json creation with interactive prompt: GitHub username (auto-detect), default assignee filter, GSD model profile, notification preferences. Write to .mgw/config.json.

Acceptance Criteria

• Add interactive config wizard to mgw:init for first-time setup

GSD Route

quick

Phase Context

Phase 29: Shell Completions and Config Wizard of v4 — Interactive CLI & TUI

Depends on

none

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MGW · work-started · 2026-03-02T23:52:18.773Z
Milestone: v4 — Interactive CLI & TUI | Phase 29: Shell Completions and Config Wizard

Work Started

Issue	#125 — Add interactive config wizard to mgw:init for first-time setup
Route	quick
Phase	29 — Shell Completions and Config Wizard
Milestone	v4 — Interactive CLI & TUI

Milestone Progress (8/9 complete)

#	Issue	Status	PR
117	Design TUI issue browser component	✓ Done	—
118	Implement fuzzy search and keyboard navigation	✓ Done	#162
119	Add label and milestone filter pane	✓ Done	#163
120	Add per-stage spinners to mgw:run	✓ Done	#164
121	Add milestone progress bar to mgw:milestone	✓ Done	#165
122	Add --watch flag and live-refresh panel	✓ Done	#166
123	Generate shell completion scripts	✓ Done	#167
124	Add completion installation step to mgw:init	✓ Done	#168
125	Add interactive config wizard to mgw:init	◆ In Progress	—

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MGW · pr-ready · 2026-03-02T23:55:21.337Z
Milestone: v4 — Interactive CLI & TUI | Phase 29: Shell Completions and Config Wizard

PR Ready

PR #169 — #169

Testing procedures posted on the PR.
This issue will auto-close when the PR is merged.

Milestone Progress (9/9 complete)

#	Issue	Status	PR
117	Design TUI issue browser component	✓ Done	—
118	Implement fuzzy search and keyboard navigation	✓ Done	#162
119	Add label and milestone filter pane	✓ Done	#163
120	Add per-stage spinners to mgw:run	✓ Done	#164
121	Add milestone progress bar to mgw:milestone	✓ Done	#165
122	Add --watch flag and live-refresh panel	✓ Done	#166
123	Generate shell completion scripts	✓ Done	#167
124	Add completion installation step to mgw:init	✓ Done	#168
125	Add interactive config wizard to mgw:init	✓ Done	#169