docs: synchronize API.md and RUN.md with ERD.md master integration

API.md

@@ -155,6 +155,8 @@ Summary and history for a specific location.
 
 ## Database Schema
 
+Full enterprise ERD and integration architecture is documented in [`ERD.md`](ERD.md).
+
 ```sql
 CREATE TABLE batch_runs (
     id                   INTEGER PRIMARY KEY AUTOINCREMENT,
@@ -180,7 +182,7 @@ CREATE TABLE batch_runs (
 );
 ```
 
-> **Note**: Weight counting and growth curves start at **Cycle Day 1** (Day 0 = DOC arrival baseline 42.0g).
+> **Note**: Weight counting and growth curves start at **Cycle Day 1** (Day 0 = DOC arrival baseline 42.0g). Daily aggregations feed into the central Audrix `CHICKEN_COUNTING` (`cc_id`) and `CHICKEN_WEIGHT` (`cw_id`) tables.
 
 Data is inserted automatically by the batch runner when `location` and `db_path` are configured in the batch YAML, or manually via:
 

RUN.md

@@ -345,7 +345,7 @@ All SQLite database rows and JSON outputs will automatically be stamped with `"s
 
 ## 9. Weight Estimation, Curation & Storage System
 
-The edge chicken counting pipeline aggregates physical metric measurements and predicts chicken weights during daily counting runs.
+The edge chicken counting pipeline aggregates physical metric measurements and predicts chicken weights during daily counting runs. Full architecture and schema mapping are documented in [`ERD.md`](ERD.md).
 
 ### Day 0 vs. Day 1+ Lifecycle Rule
 - **Day 0 (`cycle_start_date`)**: Day-Old Chicks (DOC) arrival date (standard baseline $42.0\text{ g}$). **Counting ONLY** to establish starting inventory headcount.