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-providers/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "gyandoot-providers"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+description = "GyanDoot v2 — LLM provider abstraction (OpenAI, Anthropic, Ollama, etc)"
+
+[dependencies]
+gyandoot-core = { path = "../gyandoot-core" }
+tokio.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+reqwest.workspace = true
+thiserror.workspace = true
+anyhow.workspace = true
+tracing.workspace = true
+async-trait.workspace = true
+tokio-stream.workspace = true
+futures.workspace = true