[saiyam1814]

What changes

New Billing Adapters section in the docs sidebar, mirroring the adapter graphic on the landing page:

• Stripe (docs/stripe.html), the guide that was missing:
  • install in test mode with keys in Secrets, and every setting
  • meters per metric and SKU, including which meters actually receive events
  • customers and how they are matched, with the search fallback
  • prices and automatic subscriptions, and invoice previews
  • exactly-once delivery and Stripe's limits (35 days, 24h identifier window, 20 prices per subscription)
  • dead letters, reconciliation, and webhooks to billing states and enforcement
  • offboarding and troubleshooting
• Metronome (docs/metronome.html): customers, billable metrics and their group keys, contracts, the Stripe link, pricing on dimensions, delivery, reconciliation, webhooks.
• Lago (docs/lago.html): the Lago walkthrough moved out of Getting Started, plus running the whole pipeline on a laptop with vind.
• Custom Billing Adapter (docs/custom-adapter.html): the webhook adapter (event types, signature verification, retries), the ingest API, and writing a Go adapter. The example compiles against the repo.

Getting Started is adapter-neutral now: choose a billing platform, install, configure pricing and packaging, verify. It had been Lago-only, with v0.1 commands and log output.

Terminology follows vCluster Labs usage across the docs, README, chart notes and demo script:

• tenant cluster, control plane cluster, AI Cloud
• billing platform for Stripe, Metronome and Lago; billing adapter for vBilling's connectors
• "Node capacity tracking" restored on the landing page
• "reserved" used only as a capacity type
• no selling language around shared GPUs
• "vCluster Labs" in the footer

Fixes found along the way

• Landing page: the AI Clouds section lost its two-column layout in v0.2, because a rename broke the CSS class names.
• Metronome pricing example: the pricing and presentation group keys must together form the metric's compound group key, so GPU hours need billing_mode in the pricing key.
• Troubleshooting quoted v0.1 log lines that no longer exist.
• Billing states, including manual overrides, only exist when a Stripe or Metronome webhook secret is set. This is now documented.
• The admission policy acts in the control plane cluster, so it cannot hold tenant clusters on Private Nodes, Auto Nodes or Standalone. This is now documented.
• Docs pages and the landing quick start scrolled sideways at phone width. All 11 pages now fit 390px.
• .gitignore covers the key file names the docs tell you to create (stripe-test-key, lago-api-key, and so on).

Checked: internal links and anchors across all 11 pages, helm lint, bash -n scripts/demo.sh, and a secrets scan of the diff (placeholders only).

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