solo-billing-monitorlisted

# Solo Billing Monitor Cost-creep on a paused project is the silent killer for a solo founder running 7 things at once — Surface 4 of `workflows/solo-ops.md` calls it out explicitly. This skill takes current-week and prior-week spend across the operator's stack of services and produces the weekly rollup: a sorted markdown table, a delta column, and a watch list. Most-likely invocation is end-of-week, after Friday touchpoints, before the Monday review. ## When to Use - The user asks for the weekly cost rollup, the cost-creep audit, or any variant of "where is my money going across the stack". - The user pastes usage exports from Vercel, Railway, Supabase, Anthropic, OpenAI, or Cloudflare and asks for a comparison against last week. - The user invokes the skill explicitly on a non-default cadence (mid-week spike check, post-incident audit) and supplies the numbers. - The user just shipped a new product on a paused stack and wants a baseline before the next billing cycle lands. - ECC has `customer-billing-ops` (billing customers), `finance-billing-ops` (financial-ops), and `ecc-tools-cost-audit` (audits ECC's own tooling cost). None do solo-founder cross-cloud cost rollup; use this one for the operator's personal infra spend. ## Inputs - The list of services in scope. Default set: Vercel, Railway, Supabase, Anthropic, OpenAI, Cloudflare. Honour any added or removed service the user names (e.g. add Sentry, Mercado Pago, Cloudflare R2; remove anything pre-revenue free-tier).