Initial scaffold: GyanDoot v2.0 in Rust

Full Cargo workspace with 11 crates:
- gyandoot-core: Shared types, config, error types
- gyandoot-agent: Agent loop, tool execution, context compression
- gyandoot-providers: LLM provider abstraction (OpenAI, Anthropic, Ollama)
- gyandoot-memory: MemPalace persistent memory system
- gyandoot-platform: Platform adapters (Telegram, Discord, Webhook, CLI)
- gyandoot-security: Credential vault, sanitizer, threat detector
- gyandoot-kanban: Task decomposition, swarm orchestration, diagnostics
- gyandoot-subagents: Sub-agent spawning and orchestration
- gyandoot-skills: Skills discovery, loading, preprocessing, bundles
- gyandoot-profile: Multi-agent profile manager
- gyandoot-gateway: Gateway sessions, routing, access control

Plus: CLI entry point with clap, cross-platform installer script,
KANBAN.md, .gnpl/AGENTS.md

Workspace compiles clean: cargo check passes with 0 errors.

crates/gyandoot-core/src/lib.rs

@@ -0,0 +1,13 @@
+//! GyanDoot Core — Shared types, configuration, and error types for the platform.
+//!
+//! This crate provides the foundational types used across all other GyanDoot
+//! crates: agent identifiers, message types, configuration structures, and
+//! a unified error hierarchy.
+
+pub mod types;
+pub mod config;
+pub mod error;
+
+pub use types::*;
+pub use config::*;
+pub use error::*;