refactor: move research domain to repository root (#58)

Move the complete research domain from docs/research to root-level research, update indexes and path-aware tooling, and align raw snapshot governance and CODEOWNERS.\n\nVerified with make test and GitHub CI.

llms.txt

@@ -50,16 +50,16 @@ vibe-coding-cn 是一个中文 Vibe Coding / AI 结对编程系统教程，帮
 - docs/references/quality-gates-and-pitfalls.md
 - docs/references/low-level-program-logic.md
 - docs/references/technology-stack.md
-- docs/research/README.md
-- docs/research/research-domain-contract.md
-- docs/research/research-value-application-map.md
-- docs/research/research-transfer-synthesis.md
-- docs/research/harness/harness-engineering.md
-- docs/research/openai-codex/README.md
-- docs/research/shanraisshan-claude-code-best-practice/README.md
-- docs/research/cline-cline/README.md
-- docs/research/aider-ai-aider/README.md
-- docs/research/tmux-ai-swarm.md
+- research/README.md
+- research/research-domain-contract.md
+- research/research-value-application-map.md
+- research/research-transfer-synthesis.md
+- research/harness/harness-engineering.md
+- research/openai-codex/README.md
+- research/shanraisshan-claude-code-best-practice/README.md
+- research/cline-cline/README.md
+- research/aider-ai-aider/README.md
+- research/tmux-ai-swarm.md
 - docs/workflow/development-process.md
 - skills/auto-tmux/references/ai-swarm-collaboration.md
 - skills/README.md#当前保留