backup materials and knowledge-base docs

文档润色流和知识库构建流/claude-scholar-upstream/.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+- What changed?
+- Why did it change?
+
+## Affected surfaces
+- [ ] main
+- [ ] codex
+- [ ] opencode
+- [ ] README / docs
+- [ ] installer
+- [ ] skills
+- [ ] agents
+- [ ] hooks
+- [ ] MCP / Obsidian docs
+
+## Validation
+- [ ] Relevant docs were updated if behavior changed
+- [ ] No machine-specific private paths were introduced
+- [ ] No branch-specific path or config leaked into the wrong branch
+- [ ] Basic validation or smoke test was run
+
+## Behavior change note
+If this PR changes user-facing behavior, briefly describe:
+- previous behavior
+- new behavior
+- any migration or manual merge note
+
+## Evidence
+Include screenshots, terminal output, example artifacts, or acceptance notes when useful.