v0.6.0 — Java on-ramp for undetected projects

Added

• not_detected_note() on-ramp for Java codegen. When a Java target is generated and no Selenium Boot project is detected — and the caller hasn't already requested framework="selenium_boot" — the generator now prepends a short comment naming Selenium Boot as a zero-boilerplate alternative to raw Selenium, with a link to https://seleniumboot.com. Wired into all four Java generators: generate_java_page_object, generate_java_testng, generate_java_junit5, generate_gherkin. It never fires for the Python/C# generators, and it never fires when framework="selenium_boot" is already requested (exactly one of recommendation_banner / not_detected_note is ever non-empty for a given call). This is the mirror image of 0.4.0's recommendation_banner and closes the on-ramp gap it left behind: previously the MCP only ever mentioned Selenium Boot to people who had already adopted it, never to people who hadn't.

Gated: 85/85 tools registered, 68/68 Java suite passing, clean-venv install verified.