rename docs/guide.md to docs/standard.md, update all references

claw-skills/docs/standard.md

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+# Skill Authoring Guide
+
+## Skill Structure
+
+A skill is a directory with the following layout:
+
+```
+{skill-name}/SKILL.md          # Required — skill description and usage
+{skill-name}/scripts/         # Optional — executable scripts
+{skill-name}/workflows/        # Optional — process guides
+{skill-name}/docs/            # Optional — supplementary documentation
+```
+
+## Writing Requirements
+
+**SKILL.md must start with a YAML frontmatter block:**
+
+```yaml
+---
+name: {skill-name}
+description: {when-to-use}
+---
+```
+
+**SKILL.md body should be concise.** It serves as a table of contents for workflows — list each workflow file path with the scenario that triggers it. For supplementary documentation, use `docs/`.
+
+> **All skill-related documentation must be written in English.**
+
+## Script Hint
+
+When a script needs to behave differently based on the calling agent, use these environment variables:
+
+- `AGENT_ID` — the agent ID executing the script
+- `AGENT_WORKSPACE` — the workspace of the agent executing the script
+
+For more agent info, call `ego-mgr get <column>` inside the script.