dsh-codex-import: Read-only Compatibility Scanner for DeepSeek Harness Codex Configuration

# Introduction If you maintain two sets of agent environments, Codex and DeepSeek Harness (DSH), the issue during configuration migration is rarely a lack of tools, but rather a lack of clarity: Codex's `config.toml`, hooks, Skills, and `AGENTS.md` are scattered across various user-level and project-level locations. Determining which can be directly mapped to DSH and which are unsupported requires manual verification of each item one by one. Copying configurations directly poses risks due to differences in permission semantics and inconsistent support scopes for hooks. `dsh-codex-import` isolates this step: it performs a read-only inventory first and provides a categorized result; version 0.1 does not execute any migration. DSH's philosophy is "Everything is a plugin", this...