fix(sandbox): correct SDK examples and retry guidance

[drewstone]

The Sandbox quickstart and SDK reference now make every TypeScript example a separate program. Each block imports the SDK, creates its own client, validates its configuration, and initializes the resources it uses. Temporary machines and GPU leases are released in finally; reconnect examples explicitly require saved sandbox, session, and turn IDs.

Correct obsolete batch/task calls and qualify completed-turn deduplication by retained cache records. Handle the published SDK's nullable client.get() result. Task sessions clone the supplied public repository; example shell commands no longer assume missing project files. Include tsx installation and the command to run a saved example.

Validation on drew-gtr-pro:

• All 12 TypeScript fences compile independently against the registry package @tangle-network/sandbox@0.58.8, with strict NodeNext/ES2022 checks and skipLibCheck: false. The extracted files contain no added ambient declarations or hidden setup.
• Docs build, Next lint, formatting, harness wording checks, and whitespace checks pass. Current-head checks finished: nine successful checks and two neutral Netlify informational checks.
• Chrome verified the hosted overview, quickstart, and SDK reference from Netlify deploy 6abd9fdae34172000859a076. Every rendered TypeScript block includes its own client and key guard; quickstart blocks include cleanup. At 400 pixels, both code pages have body and root widths of 400 pixels. The temporary viewport was reset.
• An independent source review checked resource cleanup, cloned-Git task setup, nullable sandbox lookup, and saved-ID/retention boundaries.

The quickstart preview and SDK reference preview remain the review surfaces. The requested Sandbox documentation changes have completed source and browser review.

No authenticated funding, Sandbox provisioning, paid agent/GPU execution, or provider integration was performed for this documentation change. Compilation and rendered-page checks establish example syntax/API compatibility and presentation; they do not establish live paid execution. Prior fixture runs are not delivery proof for this revision.

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[tangletools]

✅ Auto-approved PR — 3a768aad

Blanket team auto-approval is intentional. The merge gates are CI and codex-p1.
No automated review runs on this PR. This approval rests on the rule above alone.

_{tangletools · auto-approval · reason: blanket_auto_approve · 2026-09-30T03:18:06Z}

[tangletools]

✅ Auto-approved PR — a07f0732

Blanket team auto-approval is intentional. The merge gates are CI and codex-p1.
No automated review runs on this PR. This approval rests on the rule above alone.

_{tangletools · auto-approval · reason: blanket_auto_approve · 2026-10-01T08:27:42Z}