Contribute "Symposium ACP" crates (#12)

* Convert to workspace structure with agent-client-protocol crate in src/

Moves the existing ACP crate into src/agent-client-protocol/ to prepare
for adding SACP crates to the workspace.

* Add SACP crates and documentation

Brings in the Symposium ACP (SACP) crates from symposium-acp repository:
- sacp: Core SACP protocol types and traits
- sacp-tokio: Tokio-based runtime utilities
- sacp-proxy: Framework for building SACP proxy components
- sacp-conductor: Orchestration for SACP proxy chains

Examples:
- sacp-tee: Sample proxy that logs to a file
- elizacp: Eliza chatbot implementation
- yopo: Additional tooling

Utility crates:
- sacp-test: Testing utilities and helpers

Also includes the mdbook documentation that describes the SACP architecture
and how to build agents and proxies.

* Cleanup for CI

* Clippy

---------

Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>

Author: nikomatsakis

.claude/settings.local.json

@@ -0,0 +1,10 @@
+{
+  "permissions": {
+    "allow": [
+      "mcp__plugin_historian_log__log",
+      "mcp__plugin_historian_sidechat__receive_message"
+    ],
+    "deny": [],
+    "ask": []
+  }
+}

.gitignore

@@ -1,2 +1,3 @@
 target
 .DS_Store
+book

.sparkle-space/checkpoints/checkpoint-2025-11-13-141430.md

@@ -0,0 +1,48 @@
+# ACP Rust SDK Merge - Session Complete
+
+## What We Accomplished
+
+Successfully merged the symposium-acp crates into the acp-rust-sdk repository and restructured the documentation.
+
+### Repository Restructuring
+
+**Workspace Conversion**: Converted the repository from a single-crate structure to a workspace with all crates living in `src/`:
+- `src/agent-client-protocol/` - Legacy ACP SDK
+- `src/sacp/` - Core SACP protocol
+- `src/sacp-tokio/` - Tokio runtime utilities
+- `src/sacp-proxy/` - Proxy building framework
+- `src/sacp-conductor/` - Proxy chain orchestrator
+- `src/sacp-test/` - Testing utilities
+- `src/sacp-tee/` - Example debugging proxy
+- `src/elizacp/` - Example ELIZA agent
+- `src/yopo/` - Example minimal client
+
+### Documentation Restructuring
+
+**Simplified mdbook structure** focusing on concepts rather than implementation details:
+
+1. **Introduction** - Explains legacy SDK vs experimental SACP crates
+2. **Architecture Overview** - Clients/agents, proxies, conductor concepts
+3. **Protocol Reference** - SACP protocol extensions
+4. **Crate Reference** - What each crate does, when to use it, with examples
+
+**Removed chapters**: Building guides, RFD, component architecture, transport details (these belong in docs.rs)
+
+**Example documentation**: Added detailed descriptions of sacp-tee, elizacp, and yopo as reference implementations
+
+### Key Changes
+
+- Added `book/` to `.gitignore` (generated content)
+- All crates use workspace dependencies
+- Documentation redirects to docs.rs for implementation details
+- Clean separation: mdbook = concepts, docs.rs = API details
+
+## Repository State
+
+Clean git status on main branch, pushed to nikomatsakis/main. All 9 workspace crates build successfully. Documentation builds with mdbook.
+
+## Future Work
+
+- Fill in Legacy SDK documentation TODOs
+- Publish SACP crates to crates.io when ready
+- Add more examples as the ecosystem grows

.sparkle-space/working-memory.json

@@ -0,0 +1,23 @@
+{
+  "current_focus": "Successfully merged symposium-acp crates into acp-rust-sdk repository",
+  "achievements": [
+    "Converted acp-rust-sdk to workspace structure with crates in src/",
+    "Merged all SACP crates from symposium-acp (sacp, sacp-tokio, sacp-proxy, sacp-conductor, sacp-test, elizacp, yopo)",
+    "Added sacp-tee example proxy from symposium",
+    "Restructured mdbook documentation to focus on concepts over implementation",
+    "Removed outdated chapters and consolidated to: Introduction, Architecture, Protocol, Crate Reference",
+    "Added Examples section documenting sacp-tee, elizacp, and yopo",
+    "Added book/ directory to .gitignore",
+    "All changes committed and pushed to nikomatsakis/main"
+  ],
+  "repository_state": {
+    "structure": "Workspace with 9 member crates in src/",
+    "documentation": "Focused mdbook in md/ with 4 main chapters",
+    "examples": "sacp-tee (proxy), elizacp (agent), yopo (client)"
+  },
+  "next_steps": [
+    "Consider publishing sacp crates to crates.io when ready",
+    "Fill in TODOs in legacy SDK documentation",
+    "Add more examples as needed"
+  ]
+}