Workshop Compare

Read $MIGRATION_DIR/scenarios/index.json. If missing, tell the user to Apply & reprice once (baseline capture) and stop.

Step 2: Build rows

For each entry in index.scenarios[] (stable order: baseline first, then by created_at):

1. Read the manifest at entry.manifest.
2. From the baseline preferences copy and this scenario’s preferences copy, resolve display columns:
   • Region ← global.target_region
   • HA ← data.database_ha if present else global.availability
   • Compute ← design_constraints.compute_target.default (or legacy .value)
   • Arch ← workshop.cpu_architecture or x86_64
3. From estimation_summary: Premium / Balanced / Optimized $/mo and complexity_tier (all three tiers — pitch compares Graviton Optimized vs Multi-AZ Premium, not Balanced alone).
4. Mark the row active when scenario_id == index.active_scenario_id.

Step 3: Present

Output a markdown table:

Under the table:

• One line of knob deltas for the active scenario vs baseline (preferences_subset from the active manifest).
• If any scenario has a non-null region_note, quote it once (note: regional deltas are qualitative; rates are cache-based).
• estimation_summary.calculator_url is always null — no shareable calculator link is produced.
• Remind: discovery inventory is frozen; Generate uses the active working-tree artifacts.

Keep under 25 lines total.