* Make Stripe Checkout configurable via billing env knobs
Replace the hard-required $1 first-month coupon with env-driven trial days,
optional coupon, and allow_promotion_codes so SaaS can switch checkout modes
without a code change.
Co-authored-by: Cursor <cursoragent@cursor.com>
* Fix no-effect ReflectionClass import in checkout test
CI treats bare global use statements as ErrorException and aborts
loading the suite before any assertions run.
Co-authored-by: Cursor <cursoragent@cursor.com>
* Document checkout env knobs in AGENTS.md instead of .ai/
Remove the Boost record-rule .ai/rules folder and keep durable billing
checkout guidance in AGENTS.md / CLAUDE.md project-specific rules.
Co-authored-by: Cursor <cursoragent@cursor.com>
* Harden checkout env knobs from review findings
Default allow_promotion_codes to false, grant Stripe trial only to
first-time subscribers, clarify the coupon/promo XOR error, and cover
negative XOR cases plus StartSubscriptionCheckout wiring.
Co-authored-by: Cursor <cursoragent@cursor.com>
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Co-authored-by: Cursor <cursoragent@cursor.com>
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