v1.0.1 — showcase gallery + AI-agent tooling

Docs-only patch release — no code changes, no breaking changes.

Added

• README Showcase gallery — PNG samples for all four built-in Theme presets (CLASSIC, DARK, PASTEL, HIGH_CONTRAST), a math-challenge PNG, an SVG word sample and a linkable WAV accessibility sample under docs/assets/showcase/.
• AGENTS.md — context file for AI coding agents (Cursor, Windsurf, Claude Code, Copilot Workspace, aider, …) with deterministic copy-paste recipes for every adapter / storage / rate-limiter / renderer combination, the full public symbol index, and a "don't do this" pitfall list.
• llms.txt — llmstxt.org-compatible index of the public API and canonical recipes, for retrieval-augmented tooling.
• scripts/render_showcase.py — reproducible script that regenerates every showcase asset using the library's own public API.

Changed

• README.md: new "For AI agents / LLM tooling" section, AI-friendly badge.

See CHANGELOG.md for the full history.