skill trimming: rewrite core skills and stream-react

[myandrienko]

What

Replaces the four core skills with the v2 fresh-write: stream and stream-react are rewritten from zero; stream-builder and stream-docs are deleted. Net: 919 insertions, 9,624 deletions.

The rewrite applies one deletion criterion to every line: it survives only if it prevents a failure an agent actually hits. Everything the getstream CLI explains itself (-h, getstream docs local copies), everything the official docs cover, and everything a competent agent infers on its own was removed.

Changes

• stream - a ~400-word router: conceptual overview, the CLI as the base tool ("read -h" replaces the command table and safety rules), one first-match routing list. RULES.md, peers.yaml + schema, the track dispatch table, the verbatim /stream menu, and the trust/consent prose are gone.
• stream-react - one linear build flow (init, scaffold, credentials, SDKs, configure, build, verify, run) with conditional clauses instead of tracks, plus separate sections for auditing, upgrading an SDK major, matching a reference design, building an AI support agent, and migrating from Sendbird. Product blueprints and docs-map.md are replaced by the CLI-served local docs; the curated Sendbird mapping is kept nearly whole (concrete API joins are the knowledge), the extended mapping verbatim as a grep-only lookup.
• stream-builder - deleted. It was a near-clone ancestor of stream-react (same Steps 0-7, also scaffolds Next.js). Unique content was salvaged: the use-case table, hub-first page flow, and the AI-support-agent recipe (now stream-react/ai-support-agent.md).
• stream-docs - deleted. Docs questions route to the local docs via getstream docs.

Verification

Five independent empty-context agents audited v1 against v2, testing every absent idea for recoverability by actually running getstream -h and reading the local docs pages. Result: ~85-90% of distinct v1 ideas present or verified recoverable; the ~16 real losses were each restored (enhance-mode rules, capability-debugging traps, fixture-channel recipe, the AI recipe, livestream/design gotchas) or explicitly ruled out.

Deliberately out of scope (follow-ups)

• Root README.md / AGENTS.md still describe the deleted skills and old structure.
• stream-react-native, stream-feeds-migration (and other packs pending their own rewrites) still reference the deleted ../stream/RULES.md / stream-docs.
• The getstream skills default set and the getstream.io agent-skills docs pages still list stream-builder/stream-docs.
• Pending fact-check: whether the livestream call type really denies host publish grants (v1 claim, currently not restored).
• Docs fixes that would delete further skill lines: import.md shows the old stream-cli; video best-practices recommends the deprecated no-op usePersistedDevicePreferences.

🤖 Generated with Claude Code