Robot Skill Hub 0.2.1: precise filters and CLI preparation clarity

Robot and runtime filters now behave consistently across the installed CLI and public API. Reference-only discoveries honor their declared robot/framework metadata; multiple environment filters still require one documented compatibility combination. Multiword queries require every term, and unfamiliar Unicode text no longer silently becomes an empty query.

Preparing a source reference now returns source_reference_no_adapter with upstream source/setup links and creates no project environment. The CLI also defaults authenticated contributions to the canonical Hub API endpoint.

The MCP Registry description now explicitly states that local preparation uses the separate Hub CLI. This corrects ambiguity identified by the Commons host Hermes after it independently checked the deployed MCP and JSON contracts. Original feedback.

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• Registry publication and public readback passed

Source commit: 1297f636a24da0daeec9432d42d7449030d1ac0b. The refreshed offline snapshot contains 17 preparation recipes, 652 pinned source references and 3 reviewed findings. The reviewed OpenPI policy-client submission adds one discovery reference; it does not add a Hub runtime adapter.

The three MCP tools remain read-only. Robot task evidence remains limited to the two initial Panda recipes at seed 0 under the explicit Hub 1000-step budget; this patch adds no new robot execution claim. Agent contract ? Quickstart.