Release 2.1.1

What's Changed (since v2.1.0)

Added

• Address PR #2 review feedback on pin-config safety (Jeff Papiez)
• Add .github/copilot-instructions.md for Copilot context (Jeff Papiez)
• Address code review: input validation, race condition guard, nav consistency (copilot-swe-agent[bot])
• Add multi-board PN532 SPI support with runtime-configurable pins (copilot-swe-agent[bot])
• feat: add ESP web installer page for browser-based firmware flashing (Jeff Papiez)

Fixed

• Fix release workflow env references after board rename (Jeff Papiez)
• Fix const-correct pin parameter parsing in website handler (Jeff Papiez)
• Fix CI workflow environment name for firmware build (Jeff Papiez)
• fix: add root redirect to installer page for GitHub Pages (Jeff Papiez)

Changed

• Merge pull request #2 from OlyForge3D/copilot/feature-configurable-pins-selection (Jeff Papiez)
• Multi-board PN532 SPI support with runtime-configurable pin mapping (copilot-swe-agent[bot])
• Initial plan (copilot-swe-agent[bot])