chore: finalize project cleanup and documentation optimization

## 归档内部文档
- 将 docs/superpowers/ 内部决策文档归档至 .archive/superpowers-20260508/
- 这些文档用于架构深化决策，不应出现在用户文档中

## 优化贡献指南
- 精简 CONTRIBUTING.md，移除冗余内容
- 突出核心约束：二进制兼容性和安全限制
- 强调 OpenSpec 工作流

## 更新变更日志
- 添加架构深化相关改进记录
- 记录缓冲层统一和 CLI 入口点优化

## 优化中文首页
- 增强文案，突出项目价值
- 优化行动按钮和导航结构

## 验证
- ✅ 所有测试通过（144 项跨语言一致性测试）
- ✅ Lint 检查通过
- ✅ 文档构建成功

Author: LessUp

.archive/INDEX.md

@@ -1,17 +1,24 @@
 # Archive Index
 
-This directory contains historical artifacts retained for reference.
+本目录包含历史存档文档，仅供参考。
 
-## Contents
+## 目录结构
 
 ### specs-legacy-20260423/
+归档于 2026-04-23。包含已废弃的规范文档。
 
-Archived on 2026-04-23. Contains superseded specification documents.
+- `product/` - 旧产品需求（已被 `openspec/specs/encoding-project` 取代）
+- `rfc/` - 历史 RFC 文档（已实施或拒绝）
+- `testing/` - 旧测试规范（已被 `openspec/specs/cross-language-testing` 取代）
 
-- `product/` - Old product requirements (superseded by `openspec/specs/encoding-project`)
-- `rfc/` - Historical RFC documents (implemented or rejected)
-- `testing/` - Old testing specs (superseded by `openspec/specs/cross-language-testing`)
+### superpowers-20260508/
+归档于 2026-05-08。包含内部架构深化决策文档。
 
-## Related Archives
+- `architecture-deepening-summary.md` - 架构深化改进总结
+- `cpp-tempfile-adapter-evaluation.md` - C++ Temp-File 适配器解耦评估
+- `specs/` - 架构深化设计规范
+- `plans/` - 共享缓冲层深化实施计划
 
-- `openspec/changes/archive/` - Deferred or completed change proposals
+## 相关归档
+
+- `openspec/changes/archive/` - 延迟或已完成的变更提案

…powers/architecture-deepening-summary.md …260508/architecture-deepening-summary.mddocs/superpowers/architecture-deepening-summary.md renamed to .archive/superpowers-20260508/architecture-deepening-summary.md docs/superpowers/architecture-deepening-summary.md renamed to .archive/superpowers-20260508/architecture-deepening-summary.md

@@ -14,6 +14,7 @@ style categories and uses semantic versioning for releases.
 - Added `.clippy.toml` for Rust linting configuration.
 - Executable cross-language conformance matrix via `make test-conformance`.
 - Streaming API lifecycle and buffer contract coverage across shared C++/Go/Rust layers.
+- Unified CLI launcher module for all algorithms (shared/go/cli, shared/cpp/cli_launcher, shared/rust/cli).
 
 ### Fixed
 
@@ -22,6 +23,8 @@ style categories and uses semantic versioning for releases.
 - Rust Huffman encoding performance improved by using `Vec<u8>` instead of `String` for bitstream.
 - Fixed Rust Arithmetic Coding streaming decode compatibility for short bitstreams.
 - Fixed Rust Arithmetic Coding treatment of `0x00` input bytes so they are not confused with the EOF symbol.
+- Unified buffer growth strategies across C++, Go, and Rust for semantic consistency.
+- Transactional retry logic now preserves partial writes correctly.
 
 ### Changed
 
@@ -30,6 +33,8 @@ style categories and uses semantic versioning for releases.
 - Refined README and documentation entry points so the GitHub README stays a concise repository gateway.
 - Removed 41 unused BMAD skills from `.claude/skills/` directory (~2MB reduction).
 - Simplified `AGENTS.md` and `CLAUDE.md` for better AI agent guidance.
+- **Architecture Deepening**: Unified CLI entry points (94% boilerplate reduction) and buffer layer orchestration.
+- Archived internal decision documents to `.archive/superpowers-20260508/` for cleaner documentation structure.
 
 ## [1.0.0] - 2026-01-07