Add comprehensive TRY/CATCH, MAPINVOKE, and transaction patterns to RAG resources (v2.6.0)

New putNode examples from obsCustomerManagement and staillanibm repos:
- Example 11: TRY/CATCH with error handling (production API pattern)
- Example 12: TRY/CATCH with transaction and compensation
- Example 13: MAPINVOKE (inline service calls in MAP)
- Example 14: MAPSET with global/pipeline variable substitution
- Example 15: pub.flow:clearPipeline (preserve specific variables)

Enhanced flow language reference:
- SEQUENCE FORM="TRY"/"CATCH" documentation with structural rules
- EXIT step patterns ($parent/$flow/$loop/$iteration)
- MAPINVOKE syntax with INVOKEINPUT/INVOKEOUTPUT modes
- MAPSET variables/globalvariables attributes
- pub.flow:getLastFailureCaught full output signature
- pub.flow:setHTTPResponse, pub.art.transaction:*, pub.json:* docs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: cpoder

mcp-server-rs/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "wm-mcp-server"
-version = "2.5.0"
+version = "2.6.0"
 edition = "2024"
 description = "MCP server for managing webMethods Integration Server via pure HTTP API"
 license = "MIT"