docs: update README for PO and work order KB syncs

ref #4 — documents the new po-sync and workorder-sync Lambdas,
EventBridge schedules, DynamoDB data sources, and manual trigger
instructions.

README.md

@@ -18,14 +18,15 @@ slack-processor Lambda        ← calls Bedrock Agent, logs to DynamoDB, posts r
    │
    ▼
 Bedrock Agent (Claude Sonnet 4.5)
-   ├── Knowledge Base (AOSS + S3)    ← SA8000 docs, SOPs, employee handbook, Notion pages
+   ├── Knowledge Base (AOSS + S3)    ← SA8000 docs, SOPs, employee handbook, Notion pages, POs, work orders
    ├── QBO_Lookup action group       ← QuickBooks vendor search
    └── Google_Maps_Lookup action group ← fallback vendor search
 
 EventBridge (daily 02:00 UTC)
    │
-   ▼
-notion-sync Lambda            ← exports Office Operations Notion pages → S3 → KB ingestion
+   ├── notion-sync Lambda     ← exports Office Operations Notion pages → S3 → KB ingestion
+   ├── po-sync Lambda         ← exports purchase-orders DynamoDB → S3 → KB ingestion
+   └── workorder-sync Lambda  ← exports WorkOrders + Comments DynamoDB → S3 → KB ingestion
 ```
 
 ### Vendor Query Priority
@@ -43,6 +44,8 @@ notion-sync Lambda            ← exports Office Operations Notion pages → S3
 | Embeddings | Amazon Titan Embed Text V2 (1024 dimensions) |
 | Vector Store | OpenSearch Serverless (VECTORSEARCH) |
 | Conversation Log | DynamoDB `seahaven-conversations` (90-day TTL) |
+| PO Data Source | DynamoDB `purchase-orders` (via po-ingest) |
+| Work Order Data Source | DynamoDB `WorkOrders` + `WorkOrderComments` (via workorder-ingest) |
 | Webhook URL | `https://bot.seahaven.com/slack/events` |
 
 ## Prerequisites
@@ -143,12 +146,16 @@ lib/
     slack-handler.ts          API Gateway + webhook/processor Lambdas
     conversation-log.ts       DynamoDB table
     notion-sync.ts            EventBridge daily cron + notion-sync Lambda + Secrets Manager
+    po-sync.ts                EventBridge daily cron + po-sync Lambda
+    workorder-sync.ts         EventBridge daily cron + workorder-sync Lambda
 lambda/
   slack-webhook/              Verifies Slack signature, fires processor async
   slack-processor/            Calls agent, writes DynamoDB, posts Slack reply
   qbo-lookup/                 Bedrock action group — QuickBooks vendor search
   maps-lookup/                Bedrock action group — Google Maps Places search
   notion-sync/                Daily Notion → S3 export, triggers KB ingestion
+  po-sync/                    Daily purchase-orders DynamoDB → S3 export, triggers KB ingestion
+  workorder-sync/             Daily WorkOrders DynamoDB → S3 export, triggers KB ingestion
 scripts/
   create-aoss-index.ts        Manual fallback for AOSS index creation (not needed in normal deploy)
 ```
@@ -157,4 +164,6 @@ scripts/
 
 - **QBO refresh token** expires after 100 days of inactivity. Rotate via the [Intuit OAuth Playground](https://developer.intuit.com/app/developer/playground) and update the `seahaven/qbo/oauth` secret.
 - **Notion sync** runs daily at 02:00 UTC automatically. To trigger an immediate sync, invoke `seahaven-notion-sync` manually via the Lambda console or CLI.
+- **PO sync** runs daily at 02:00 UTC. Scans the `purchase-orders` DynamoDB table (from [po-ingest](https://github.com/Sea-Haven-Industries/po-ingest)) and exports each PO as markdown to the KB. Manual trigger: invoke `seahaven-po-sync`.
+- **Work order sync** runs daily at 02:00 UTC. Scans `WorkOrders` and `WorkOrderComments` DynamoDB tables (from [workorder-ingest](https://github.com/Sea-Haven-Industries/workorder-ingest)) and exports each work order + comment history as markdown to the KB. Manual trigger: invoke `seahaven-workorder-sync`.
 - **KB sync for manual S3 uploads** (non-Notion docs) must still be triggered manually after uploading new documents to the S3 bucket.