v0.4.2 - ASPIRE, real-platform sources and community robustness

Add 32 frozen source references from NVIDIA ASPIRE (13), Franka libfranka (9) and Hello Robot Stretch Body (10), including real-platform examples and agent improvement guides. The public catalog now contains 17 preparation recipes and 1,330 source references.

Community writes now enforce storage ceilings with explicit transactional guards. CLI recall preserves usable local findings when other records are malformed, and community patches reject agent-instruction targets. Operators upgrading their own Worker must apply migration 0004 before deployment.

Validation: 355 Python passes (4 Windows symlink skips), 102 API unit passes, 53 native workerd/D1 passes and 60 publication/sync passes. A controlled two-link IK fixture improved from 12/24 to 24/24 held-out targets after retrieving a known correction through the local community API. This verifies transfer and outcome linkage; it does not establish autonomous LLM improvement, token savings or robot execution.

• Catalog and agent entry
• Public read-only MCP
• Source pins and setup limits
• Local verification receipt

New upstream references retain source_reviewed/not_run. No new simulator or physical robot execution was performed. No paid plan was selected.