docs: add rust-only acceptance guide

docs/superpowers/acceptance/2026-03-25-superrpa-sgclaw-rust-only.md

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+# Rust-Only Acceptance Checklist
+
+## Scope
+
+This checklist covers the Rust-side work that can be verified before the SuperRPA browser repository is available locally.
+
+Covered:
+
+- pipe handshake and protocol baseline
+- task-level message types
+- HMAC canonical string alignment
+- Phase 1 rule-based Baidu search planner
+- DeepSeek provider scaffolding
+- provider-backed minimal Agent runtime with fallback to planner mode
+
+Not covered yet:
+
+- `SgClawProcessHost`
+- `PipeListener`
+- `CommandRouter` reuse in SuperRPA
+- FunctionsUI bridge integration
+
+## Required Commands
+
+Run from the feature worktree:
+
+```bash
+cd /home/zyl/projects/sgClaw/.worktrees/superrpa-browser-control
+cargo test -q
+```
+
+Optional focused checks:
+
+```bash
+cargo test --test task_protocol_test -q
+cargo test --test planner_test -q
+cargo test --test runtime_task_flow_test -q
+cargo test --test deepseek_provider_test -q
+cargo test --test agent_runtime_test -q
+```
+
+## Pass Criteria
+
+- `init -> init_ack` tests pass
+- `submit_task`, `task_complete`, and `log_entry` serialize correctly
+- HMAC output is based on newline-delimited canonical string with stable JSON ordering
+- Planner turns `打开百度搜索天气` into `navigate -> type -> click`
+- Runtime mock flow emits browser commands and finishes with `task_complete`
+- DeepSeek settings load from environment with default model `deepseek-chat`
+- DeepSeek request body matches OpenAI-compatible chat completion shape
+
+## Runtime Configuration
+
+The provider-backed path is enabled only when `DEEPSEEK_API_KEY` is present.
+
+Environment variables:
+
+- `DEEPSEEK_API_KEY`
+- `DEEPSEEK_BASE_URL` optional, defaults to `https://api.deepseek.com`
+- `DEEPSEEK_MODEL` optional, defaults to `deepseek-chat`
+
+Without `DEEPSEEK_API_KEY`, sgClaw falls back to the Phase 1 rule-based planner.
+
+## Current Branch Milestones
+
+- `b9773d4` — task pipe protocol and HMAC alignment
+- `1ab0012` — Phase 1 task planner flow
+- `0d0097b` — DeepSeek provider scaffolding
+- `9979b1f` — provider-backed Agent runtime
+
+## Next Dependency
+
+To continue beyond Rust-only acceptance, the local SuperRPA / Chromium repository path is required so Tasks 3, 4, and 5 can be implemented and verified.