release: bump version to 0.42.0

docs/technical/en/README.md

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+# Technical Docs
+
+This directory holds "current implementation and current structure" documentation, focusing on:
+
+- How the code is organized right now
+- Where the current entry points are
+- How state and components work
+- Which implementation boundaries future changes should follow
+
+What belongs here:
+
+- Quickstart and user manual
+- Frontend context
+- Earth frontend structure
+- Earth satellite footprint policy
+- Earth render layer order
+- Earth layer style property index
+- Backend runtime control
+- Collector status
+- Collection format conventions
+
+## Entry Points
+
+- [quickstart.md](/home/ray/dev/linkong/planet/docs/technical/en/quickstart.md): The shortest path to getting Planet running from scratch
+- [manual.md](/home/ray/dev/linkong/planet/docs/technical/en/manual.md): Complete usage guide for the console, `planet.sh`, Earth, and Docs
+
+What does not belong here:
+
+- Incomplete roadmaps
+- Future iteration plans
+- Large-scale refactor proposals
+
+Those belong in:
+
+- [docs/plans/README.md](/home/ray/dev/linkong/planet/docs/plans/README.md)