Replaces the static SWIFTLY_BEARER_TOKEN env-var lookup with a JIT
mint via the Firebase Identity Toolkit signUp endpoint, gated by the
firebaseApiKey published in luckysupermarkets.com/config.json.
- get_token(): returns cached JWT if exp > now+300s, else mints
- mint_anonymous_token(): fetches API key, posts signUp with
Origin/Referer headers, validates iss + exp on the returned JWT
- SwiftlyAuthMintError surfaces verbatim to ScrapeLog.error_message
- Process-local cache only; threading.Lock around mutate
Tests: 4 unit tests covering fresh mint, cache hit, near-expiry
re-mint, and Firebase non-200. Full suite: 92/92 green.
Spec: docs/specs/2026-05-06-swiftly-token-auto-mint.md
Wiring into lucky_ca_scraper deferred to AM-2.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
