Tack v0.1.0

Added

• IPFS Pinning Service API support for pin creation, listing, replacement, deletion, and upload-based pinning.
• Public IPFS gateway retrieval with ETag and Range handling plus an A2A agent card at /.well-known/agent.json.
• x402 payment authentication on Taiko Alethia for paid pinning flows, with bearer-token owner auth for follow-up pin management.
• SQLite-backed pin metadata, in-memory rate limiting, and optional best-effort replica pinning across additional Kubo nodes.

Fixed

• Production startup validation now fails fast when x402 is disabled or configured with placeholder payout or asset addresses.
• Docker and Railway deployment paths are hardened around persistent data/ storage and health checks.

Docs

• Added Railway deployment and Taiko x402 smoke runbooks covering volumes, backups, rollback, and go-live validation.