Upgrade defaults to GPT-5.6 Sol and Fable 5

[kvz]

Why

The public Node SDK types, generated docs, compiler defaults, and AI-chat schema need to expose the same workload-specific GPT-5.6 Sol, Fable 5, and Sonnet 5 behavior as the service repos.

What

• add the new model ids/capabilities, keep Assembly Instructions compilation at medium reasoning, and use Sonnet 5 for image descriptions
• sync AI SDK 7 current/legacy message normalization, including tool metadata, media, structured values, dates, circular results, and unknown tool input
• harden recursive/type-literal schema emission and Zod schema patching for the expanded public message types
• restore generated README parity and add release changesets for every affected published package

Workload policy

• general OpenAI default: gpt-5.6-sol with xhigh
• general Claude default/fallback: claude-fable-5
• image descriptions and Intercom summaries: claude-sonnet-5
• WebAgent, QA, and browser-driver runners: claude-opus-4-8
• end-user Assembly Instructions compilation: medium reasoning

Validation

• corepack yarn check — Node 248 passed/1 skipped, MCP 3 passed, relay 22 passed, with all type/lint/schema/runtime parity checks green
• focused AI-chat, schema-patch, emitter, and tsc:types tests
• three council passes; valid findings addressed

Sources

• https://developers.openai.com/api/docs/models/gpt-5.6-sol

• https://platform.claude.com/docs/en/about-claude/models/introducing-claude-fable-5-and-claude-mythos-5

• https://platform.claude.com/docs/en/about-claude/models/overview

• https://platform.claude.com/docs/en/about-claude/models/whats-new-sonnet-5

Sister PRs

• transloadit/content#5346
• transloadit/api2#8474
• transloadit/accounting#268
• transloadit/botty#196
• transloadit/team-internals#571
• kvz/clawfleet#12
• kvz/arkivz#139
• kvz/dotfiles#15