docs: comprehensive accuracy and completeness pass on public docs

[Copilot]

The public docs had several gaps and inaccuracies relative to the actual implementation: the compression level table described behavior vaguely rather than showing the actual <tool> tag format; TOON was referenced but never explained; the llm subcommand was fully implemented but absent from the docs; Python/TypeScript API reference tables were missing ~half their public exports; and the LLM design doc gave no indication of what was already shipped.

Changes by file

• concepts/how-it-works.md — Replace vague compression level descriptors with the actual <tool>name(args): description</tool> format at each level. Add schema response format section (always full description + JSON Schema regardless of active level).

• concepts/configuration.md — Add TOON section (Token-Oriented Object Notation — what it is and all four language tabs). Complete exclude_tools across all language tabs. Add --multi-server name=command CLI section. Document --config file usage and the --server-name incompatibility constraint.

• reference/cli.md + usage/cli.md — Document mcp-compressor llm subcommand (status, pull, remove, test) which was fully implemented but entirely absent from the docs. Include all options, examples, and cache directory locations.

• modules.md — Expand Python API table from ~12 to 30+ entries with categorized sections (client/proxy, config types, Just Bash, compression helpers, OAuth, MCP config). Expand TypeScript table similarly with adapters and type exports.

• reference/sdk.md — Add CompressorClient options table and CompressorProxy methods table mapping every option/method across Python/TypeScript/Rust. Full import examples for both languages.

• llm-assist-design.md — Add implementation status admonition at the top: llm CLI management commands are shipped; SDK llmAssist config and active-assist features are still planned.

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