Add documentation

Author: OracleNep

docs/agent-adapters.md

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+# Agent Adapters
+
+The MVP uses a simple command wrapper instead of hard-coding model APIs.
+
+Example:
+
+```bash
+agentflow run AF-20260613-001 --command "claude < {prompt}" --check "pytest -q"
+agentflow run AF-20260613-001 --command "codex exec --prompt-file {prompt}" --check "pytest -q"
+agentflow run AF-20260613-001 --command "cat {prompt}" --agent manual
+```
+
+`{prompt}` is replaced with the generated context-pack path.
+
+## Planned adapter presets
+
+Future versions can define presets like:
+
+```json
+{
+  "agents": {
+    "claude-code": {
+      "command": "claude < {prompt}"
+    },
+    "codex-cli": {
+      "command": "codex exec --prompt-file {prompt}"
+    },
+    "gemini-cli": {
+      "command": "gemini --prompt-file {prompt}"
+    }
+  }
+}
+```
+
+## Worktree isolation
+
+The next major feature is to run each task in its own `git worktree`, so multiple agents can work in parallel without overwriting each other's files.