Extract the pure Claude-web payload types + transforms + default tools/style
(ClaudeWebRequestPayload, ClaudeWebStreamChunk, DEFAULT_CLAUDE_MODEL,
generateMessageUUIDs, getDefaultTools, getDefaultPersonalizedStyle, transformToClaude,
transformFromClaude) verbatim into the leaf claude-web/payload.ts. Host imports the 3
it uses back (ClaudeWebRequestPayload type + the two transforms).
Host 1056 -> 835 LOC. Byte-identical bodies (verbatim 149/149), leaf imports only
randomUUID (no host import, no cycle), all module-private (no re-export). Cookie/auth/
Turnstile/TLS/HTTP dispatch untouched. Adds a split-guard; consumer tests stay green
(claude-web 13, claude-web-auto-refresh 6).
