feat: add drift-analyzer and reconciler for diverged project state

[snipcodeit]

Summary

When state detection finds Diverged state (project.json and GitHub both exist but inconsistent), spawn a drift-analyzer Task agent that identifies specific mismatches, then display a reconciliation table for user confirmation.

Output Schema (.mgw/drift-report.json)

{
  "mismatches": [
    {"type": "missing_github", "milestone": "...", "action": "create"},
    {"type": "missing_local", "github_number": N, "action": "import"},
    {"type": "count_mismatch", "milestone": "...", "local": N, "github": M}
  ],
  "summary": "N mismatches found"
}

Files

• commands/project.md — add reconcile_drift step

GSD Route

gsd:quick

Depends On

• A1 (state detection routes to this step)

[snipcodeit]

MGW execution-complete · 2026-03-01T00:00:00Z
Milestone: v3 — State Detection + Alignment | Phase 19: Alignment & Drift Logic

Implementation Complete

Implemented in commit 4efccc8 on branch feat/mgw-gsd-architecture-repair.

Added reconcile_drift step to commands/project.md: spawns a drift-analyzer Task agent that compares .mgw/project.json milestones against GitHub milestones and GSD state, writes a structured drift report to .mgw/drift-report.json with per-milestone discrepancies, and presents a reconciliation plan to the user.

Part of PR #102.