docs: add agent bootstrap and contract read router

rules/patterns/bom-decomposition/README.md

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+# BOM Decomposition Pattern Notes
+
+This file keeps examples and reference types. The normative rules live in `contract.md`.
+
+## Canonical JSON Shape
+
+```json
+{
+  "sort_order": 10,
+  "item_code": "SYS-821GE-TNHR",
+  "quantity": 3,
+  "description": "Vendor bundle",
+  "unit_price": 12000.00,
+  "total_price": 36000.00,
+  "component_mappings": [
+    { "component_ref": "CHASSIS_X13_8GPU", "quantity_per_item": 1 },
+    { "component_ref": "PS_3000W_Titanium", "quantity_per_item": 2 },
+    { "component_ref": "RAILKIT_X13", "quantity_per_item": 1 }
+  ]
+}
+```
+
+Project-specific aliases are acceptable if the semantics stay identical:
+
+- `item_code` -> `vendor_partnumber`
+- `component_ref` -> `lot_name`
+- `component_mappings` -> `lot_mappings`
+- `quantity_per_item` -> `quantity_per_pn`
+
+## Persistence Example
+
+```json
+{
+  "vendor_spec": [
+    {
+      "sort_order": 10,
+      "vendor_partnumber": "ABC-123",
+      "quantity": 2,
+      "description": "Bundle",
+      "lot_mappings": [
+        { "lot_name": "LOT_CPU", "quantity_per_pn": 1 },
+        { "lot_name": "LOT_RAIL", "quantity_per_pn": 1 }
+      ]
+    }
+  ]
+}
+```
+
+## Wrong Shape
+
+```json
+{
+  "vendor_spec": [
+    {
+      "sort_order": 10,
+      "vendor_partnumber": "ABC-123",
+      "primary_lot": "LOT_CPU",
+      "secondary_lots": ["LOT_RAIL"]
+    }
+  ]
+}
+```
+
+## Reference Go Types
+
+```go
+type BOMItem struct {
+    SortOrder         int                `json:"sort_order"`
+    ItemCode          string             `json:"item_code"`
+    Quantity          int                `json:"quantity"`
+    Description       string             `json:"description,omitempty"`
+    UnitPrice         *float64           `json:"unit_price,omitempty"`
+    TotalPrice        *float64           `json:"total_price,omitempty"`
+    ComponentMappings []ComponentMapping `json:"component_mappings,omitempty"`
+}
+
+type ComponentMapping struct {
+    ComponentRef    string `json:"component_ref"`
+    QuantityPerItem int    `json:"quantity_per_item"`
+}
+```
+
+## Normalization Sketch
+
+```go
+func NormalizeComponentMappings(in []ComponentMapping) ([]ComponentMapping, error) {
+    if len(in) == 0 {
+        return nil, nil
+    }
+
+    merged := map[string]int{}
+    order := make([]string, 0, len(in))
+
+    for _, m := range in {
+        ref := strings.TrimSpace(m.ComponentRef)
+        if ref == "" {
+            continue
+        }
+        if m.QuantityPerItem <= 0 {
+            return nil, fmt.Errorf("component %q has invalid quantity_per_item %d", ref, m.QuantityPerItem)
+        }
+        if _, exists := merged[ref]; !exists {
+            order = append(order, ref)
+        }
+        merged[ref] += m.QuantityPerItem
+    }
+
+    out := make([]ComponentMapping, 0, len(order))
+    for _, ref := range order {
+        out = append(out, ComponentMapping{
+            ComponentRef:    ref,
+            QuantityPerItem: merged[ref],
+        })
+    }
+    return out, nil
+}
+```