sprout v0.9.0

What's Changed

• Sweep: use Bun's built-in cron instead of a hand-rolled setInterval (#259) by @simpros in #260
• Ponytail decisions: drop legacy doc stubs, naming re-export, reset-marker mechanism (#250) by @simpros in #263
• Preview access: per-preview shareable link and basic-auth gate (Closes #242) by @simpros in #268
• Docs site: grouped sidebar, browsable index, single Docs entry (Closes #244) by @simpros in #264
• Ponytail cleanup: dead env-key surface, duplicated constants, stale versions (Closes #249) by @simpros in #269
• Opt-in read-only dashboard for live previews by @simpros in #267
• Install telemetry: published image reports anonymous usage (Closes #261) by @simpros in #266
• Operator-owned trace export (opt-in): OTLP/HTTP traces to a backend the operator configures (Closes #262) by @simpros in #270
• Preview governance: TTL, idle teardown, caps and connection budget by @simpros in #265
• chore: vendor documentation-writer + emil design/motion skills by @simpros in #271
• Docs corpus: rewrite every published page in its Diátaxis mode (#272) by @simpros in #274
• Docs front door + page chrome: reference console (#273) by @simpros in #275
• Preview TLS: opt-in wildcard mode (#276) by @simpros in #277
• chore(release): bump version pins 0.8.3 -> 0.9.0 (#278) by @simpros in #279

Full Changelog: v0.8.3...v0.9.0