CAMEL-23474: camel-jbang-mcp - stop echoing input route in camel_route_context response

[oscerd]

Summary

Drop the route field from RouteContextResult (CAMEL-23474). The caller just sent the
route as input — sending it back wastes LLM context-window tokens, especially for multi-line YAML
routes. Part of the ongoing camel-jbang-mcp token-reduction effort (sibling tickets:
CAMEL-23475, CAMEL-23476, CAMEL-23472).

Changes

• ExplainTools.RouteContextResult no longer carries a route field; it is now
  (format, components, eips, summary).
• ExplainTools.camel_route_context constructor call updated accordingly.
• New ExplainToolsTest covering:
  • The result record component layout (reflective check).
  • The serialized JSON no longer contains a distinctive marker from the input route.
  • Blank-route validation still throws.
  • Known component (timer) is still extracted.
• Upgrade-guide entry added under camel-jbang-mcp in camel-4x-upgrade-guide-4_21.adoc.

Test plan

• mvn -DskipTests install in dsl/camel-jbang/camel-jbang-mcp (formats + builds)
• mvn test in dsl/camel-jbang/camel-jbang-mcp — 253 tests pass, including 3 new ones
• mvn clean install -DskipTests from repo root — full reactor build green, no uncommitted
  regenerated artifacts

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Claude Code on behalf of Andrea Cosentino

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🧪 CI tested the following changed modules:

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