checkpoint: Claude Code integration + implement missing MCP var tools

Add Claude Code conductor commands, MCP server, MMA exec scripts,
and implement py_get_var_declaration / py_set_var_declaration which
were registered in dispatch and tool specs but had no function bodies.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ARCHITECTURE.md

@@ -0,0 +1,58 @@
+# ARCHITECTURE.md
+
+## Tech Stack
+- **Framework**: [Primary framework/language]
+- **Database**: [Database system]
+- **Frontend**: [Frontend technology]
+- **Backend**: [Backend technology]
+- **Infrastructure**: [Hosting/deployment]
+- **Build Tools**: [Build system]
+
+## Directory Structure
+```
+project/
+├── src/              # Source code
+├── tests/            # Test files
+├── docs/             # Documentation
+├── config/           # Configuration files
+└── scripts/          # Build/deployment scripts
+```
+
+## Key Architectural Decisions
+
+### [Decision 1]
+**Context**: [Why this decision was needed]
+**Decision**: [What was decided]
+**Rationale**: [Why this approach was chosen]
+**Consequences**: [Trade-offs and implications]
+
+## Component Architecture
+
+### [ComponentName] Structure <!-- #component-anchor -->
+```typescript
+// Major classes with exact line numbers
+class MainClass { /* lines 100-500 */ }    // <!-- #main-class -->
+class Helper { /* lines 501-600 */ }       // <!-- #helper-class -->
+```
+
+## System Flow Diagram
+```
+[User] -> [Frontend] -> [API] -> [Database]
+           |            |
+           v            v
+       [Cache]     [External Service]
+```
+
+## Common Patterns
+
+### [Pattern Name]
+**When to use**: [Circumstances]
+**Implementation**: [How to implement]
+**Example**: [Code example with line numbers]
+
+## Keywords <!-- #keywords -->
+- architecture
+- system design
+- tech stack
+- components
+- patterns