Adds a two-tier proxy system for the Playtomic availability extractor:
- Primary tier (PROXY_URLS): datacenter proxies, cheap and fast
- Fallback tier (PROXY_URLS_FALLBACK): residential rotating gateway, reliable
Circuit breaker opens after CIRCUIT_BREAKER_THRESHOLD (default: 10) consecutive
failures, permanently switching to the fallback tier for the rest of the run.
No auto-recovery — avoids flapping. If circuit opens with no fallback configured,
logs an error and writes partial results rather than continuing on a dead proxy pool.
Parallel mode submits futures in PARALLEL_BATCH_SIZE=100 batches so the circuit
breaker can stop new submissions after it opens.
New env vars added to .env.dev.sops (blank defaults):
PROXY_URLS_FALLBACK — residential/rotating gateway URL
CIRCUIT_BREAKER_THRESHOLD — consecutive failures before switching (default 10)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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