diff --git a/README.md b/README.md
index 63b2232..0acfcaa 100644
--- a/README.md
+++ b/README.md
@@ -48,19 +48,6 @@ mcs doctor
 
 That's it. Your MCP servers, plugins, hooks, skills, commands, agents, settings, and templates are all in place.
 
-<details>
-<summary><strong>📋 Prerequisites</strong></summary>
-
-- macOS 13+ (Apple Silicon or Intel)
-- Xcode Command Line Tools
-  ```bash
-  xcode-select --install
-  ```
-- [Claude Code CLI](https://docs.anthropic.com/en/docs/claude-code/overview) (`claude`)
-- [Homebrew](https://brew.sh)
-
-</details>
-
 ---
 
 ## The Problem
diff --git a/docs/README.md b/docs/README.md
index f39a59f..f77acd6 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -7,7 +7,7 @@ Documentation for [Managed Claude Stack (mcs)](../README.md) — a configuration
 New to mcs? Start here:
 
 1. [Install and Quick Start](../README.md#-quick-start) — Get your first pack running in under 2 minutes
-2. [CLI Reference](cli.md) — Complete command reference (`sync`, `pack`, `doctor`, `export`, `cleanup`)
+2. [CLI Reference](cli.md) — Complete command reference (`sync`, `pack`, `doctor`, `export`, `cleanup`, `check-updates`, `config`)
 3. [Troubleshooting](troubleshooting.md) — Common issues and fixes
 
 ## Building Tech Packs
diff --git a/docs/architecture.md b/docs/architecture.md
index 880b891..22378c0 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -9,8 +9,8 @@ Package.swift                    # swift-tools-version: 6.0, macOS 13+
 Sources/mcs/
     CLI.swift                    # @main entry, version, subcommand registration
     Core/                        # Shared infrastructure
-    Commands/                    # CLI subcommands (sync, doctor, cleanup, pack, export)
-    Install/                     # Installation logic, project configuration, convergence engine
+    Commands/                    # CLI subcommands (sync, doctor, cleanup, pack, export, check-updates, config)
+    Sync/                        # Convergence engine, project configuration, installation logic
     Export/                      # Export wizard (ConfigurationDiscovery, ManifestBuilder, PackWriter)
     TechPack/                    # Tech pack protocol, component model, dependency resolver
     Templates/                   # Template engine and section-based file composition
@@ -68,16 +68,6 @@ In the per-project model, `Configurator` (with `ProjectSyncStrategy`) composes `
 }
 ```
 
-### Manifest (`Core/Manifest.swift`)
-
-Tracks what mcs has installed globally using three data structures:
-
-1. **File hashes**: SHA-256 hashes of copied resources at install time
-2. **Installed component IDs**: set of component identifiers (e.g., `ios.xcodebuildmcp`)
-3. **Installed pack IDs**: set of pack identifiers (e.g., `ios`)
-
-The manifest covers global-scope installations. Per-project state is tracked separately by `ProjectState`.
-
 ### Project State (`Core/ProjectState.swift`)
 
 Per-project state stored as JSON at `<project>/.claude/.mcs-project`. Tracks:
@@ -105,7 +95,7 @@ Written by `mcs sync` after convergence.
 
 ### Backup (`Core/Backup.swift`)
 
-Every file write goes through the backup system. Before overwriting a file, a timestamped copy is created (e.g., `settings.json.backup.20260222_143000`). The `mcs cleanup` command discovers and deletes these backups.
+Before modifying files with user content (e.g., `CLAUDE.local.md`), a timestamped backup is created (e.g., `CLAUDE.local.md.backup.20260222_143000`). Tool-managed files are not backed up since they can be regenerated. The `mcs cleanup` command discovers and deletes these backups.
 
 ### Lockfile (`Core/Lockfile.swift`)
 
diff --git a/docs/troubleshooting.md b/docs/troubleshooting.md
index 835a262..da27a65 100644
--- a/docs/troubleshooting.md
+++ b/docs/troubleshooting.md
@@ -49,7 +49,7 @@ If you manage Node.js through nvm or similar, make sure it's available in your P
 
 **Fix**: Install Claude Code:
 ```bash
-brew install --cask claude-code
+brew install claude-code
 ```
 
 Verify:
@@ -90,21 +90,6 @@ cd /path/to/project
 mcs sync
 ```
 
-### Sosumi not responding
-
-**Symptom**: Apple documentation search via Sosumi returns errors.
-
-Sosumi uses HTTP transport (external service at `https://sosumi.ai/mcp`). Check your internet connection and verify the server is registered:
-```bash
-claude mcp list
-```
-
-If not registered, re-run sync:
-```bash
-cd /path/to/project
-mcs sync
-```
-
 ## Plugins
 
 ### Plugin not enabled