CAMEL-24977: Add semantic agent routing example with Camel A2A

Coordinate multi-intent requests with batched semantic decisions, parallel
specialist calls over A2A, bounded reply checks, and a checked merge.
Keep the coordinator and all specialists in Camel with YAML routes and
an OpenAI-compatible generation service.

Provide Maven and JBang startup, Bash and PowerShell launchers, a local
environment template, fixture tests, and opt-in decision evaluations.
Document Jev, Laya, and Julia-1 setup and license boundaries, with a
conceptual overview and three live Camel TUI screenshots of the routes.

Signed-off-by: Luigi De Masi <ldemasi@redhat.com>