extract tool definitions and dispatch into sheesh-tools crate

[Cicolas]

Summary

• Moved all_tools(), shell_quote(), and tool dispatch logic out of anthropic.rs into a new sheesh-tools workspace crate (crates/sheesh-tools/)
• Introduced ToolResult enum (Local / Command) as a provider-agnostic dispatch result
• anthropic.rs now calls sheesh_tools::dispatch() and maps the result to LLMEvent — reducing the dispatch block from ~40 lines to 3
• Any future LLM provider (OpenAI tool-use, Ollama function calling) can reuse sheesh_tools::all_tools() and sheesh_tools::dispatch() without duplicating logic
• Converted Cargo.toml to a Cargo workspace with resolver = "2"

Notes

Part of a batch of worktree changes targeting release/v1.0.5.

Tests

• Build passes (cargo build)
• Clippy clean (cargo clippy -- -D warnings)
• LLM tool calls (run_command, read_file, list_dir, make_dir, touch_file) still work end-to-end
• Local tools (system_information, read_terminal) still resolved locally without PTY

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