Release v0.27.6

What's Changed

• fix(cli): prefill provider field placeholders by @carenthomas in #2748
• feat: generate conversation titles via summary endpoint by @kianjones9 in #2721
• feat: expose extension permission overlays by @carenthomas in #2752
• refactor: remove tool_start denial support by @carenthomas in #2754
• fix: render markdown in question prompts by @carenthomas in #2757
• docs: replace extension btw example with plan mode by @carenthomas in #2756
• chore: bump version to 0.27.6 by @github-actions[bot] in #2751

Full Changelog: v0.27.5...v0.27.6