docs/ examples drifted from shipped src API — copy-paste examples fail

[pratikbin]

The hand-written guides under docs/ use APIs that don't match the shipped SDK (src/), so copy-paste examples fail. Surfaced while porting these docs to the public site (NodeOps-app/website-04 PR #194); the website copies were corrected against src/ — the same fixes are needed upstream here.

• Unpublished package name (62 refs, e.g. docs/quickstart.md): install/imports use createos-sandbox-sdk. The published name is @nodeops-createos/sandbox (package.json), so bun add createos-sandbox-sdk / the imports fail.
• runCommand: docs/how-to/error-handling.md:49,224 runCommand("echo hello"), :123 runCommand("ls /"), docs/reference/client.md:185 runCommand(["bash","-c",...]). Signature is runCommand(cmd, args[]) and returns ExecResponse { result, exec_ms } — read out.result.stdout (src/sandbox.ts:265, src/types.ts:406).
• client.sandboxes.*: docs/how-to/files.md:28,76, docs/reference/helpers.md:43. No sandboxes sub-API — use client.createSandbox(...) / client.getSandbox(...) (src/client.ts:593,640).
• template / templateId: docs/how-to/streaming.md:30,81,122, docs/how-to/error-handling.md:47,121,222,251, docs/reference/errors.md:217. The create field is rootfs (src/types.ts:202).
• Types reference (docs/reference/types.md): :169 replacement → successor; RootfsData omits required rootfs: string[] + default: string; :382 ssh_pubkeys → keys (AddSSHPubkeysRequest); :478 ExecRequest lists timeout_ms (+envs) it doesn't expose (real: cmd/args/stream); ExecResponse omits exec_ms; :820 ReadyzResponse.message → reason (+ scheduler_last_ok_ms_ago).

Root cause: docs/ is hand-maintained and drifts from src/. Consider generating the types reference from src/types.ts or adding a docs typecheck.