Log product telemetry

BTX.log(...) accepts an event immediately and sends it later. The static facade returns an enqueue disposition, not a network-delivery result.

BTX.log(
    "checkout_started",
    properties: [
        "cartId": cart.id,
        "itemIds": cart.items.map(.id),
        "totals": [
            "subtotal": cart.subtotal,
            "currency": cart.currency
        ]
    ]
)

The SDK buffers logs until configuration, identity, and runtime transport are ready.

Properties can contain strings, integers, doubles, booleans, nil, arrays, dictionaries keyed by String, or explicit BTXJSONValue values.

• Use a stable event name such as checkout_started.
• Prefer product identifiers and bounded values over free-form dumps.
• Do not include passwords, access tokens, or server credentials.
• Keep property shapes consistent so events remain comparable.

When logs are enabled, BTX records one canonical app.snapshot event after the runtime starts. It includes privacy-safe app, operating system, device family, architecture, simulator, and SDK version context.

The SDK intentionally excludes advertising identifiers, identifierForVendor, serial numbers, the user-assigned device name, and other stable personal device identifiers.