refactor: update internal command references in all plugin files

Updated:
- projman: 4 commands + 4 skills + integration snippet
- git-flow: 4 commands + 3 skills + integration snippet
- pr-review: 1 command cross-reference
- cmdb-assistant: 1 command + 1 skill
- data-platform: 8 commands + integration snippet
- viz-platform: 11 commands + integration snippet
- contract-validator: 1 command + 1 skill + 1 agent

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/data-platform/commands/data-ingest.md

@@ -1,4 +1,4 @@
-# /ingest - Data Ingestion
+# /data-ingest - Data Ingestion
 
 ## Skills to Load
 - skills/mcp-tools-reference.md
@@ -11,7 +11,7 @@ Display header: `DATA-PLATFORM - Ingest`
 ## Usage
 
 ```
-/ingest [source]
+/data-ingest [source]
 ```
 
 ## Workflow
@@ -31,9 +31,9 @@ Display header: `DATA-PLATFORM - Ingest`
 ## Examples
 
 ```
-/ingest data/sales.csv
-/ingest data/customers.parquet
-/ingest "SELECT * FROM orders WHERE created_at > '2024-01-01'"
+/data-ingest data/sales.csv
+/data-ingest data/customers.parquet
+/data-ingest "SELECT * FROM orders WHERE created_at > '2024-01-01'"
 ```
 
 ## Required MCP Tools