Buzz Desktop v0.3.39

• fix: close cross-process keychain race and namespace dev-build nest (#1409) (e8adc3383)
• feat(relay): allow agent owners to edit/manage agent-owned content (#1403) (0042c8e10)
• fix(media): support IRSA/credential-chain S3 auth and configurable signing region (#1406) (06ef533ec)
• fix(desktop): fold baked build env into in-process model discovery (#1376) (f061ae9c8)
• docs: link VISION_ACTIVITY from the VISION index (#1405) (aa1042b16)
• test(desktop): gate keychain-write test behind --ignored (#1404) (36f32291e)
• Refactor oversized mobile widgets (#1401) (71b2c41e9)
• perf(desktop): stop beachballs on agents menu and thread open (#1402) (34d61acc9)
• feat(desktop): rebuild agent activity feed around a classifier registry and twelve render classes (#1381) (5cc09e698)
• fix(thread): stop mid-scroll content jump in live threads (#1397) (42ec17f13)
• fix(ci): restore main to green — tauri fmt, personas.rs file-size split, Windows path test (#1399) (67c47de69)
• fix(desktop): enable buzz-dev-mcp MCP server for Codex agents (#1394) (b74ed858f)
• fix(ci): restore E2E flakiness fixes for pgschema, docker-pull, and spec timing (#1396) (fdf29c457)
• fix(personas): persist pack-backed persona UI edits across reboot (#1392) (a7e1202cc)
• fix(buzz-acp): clear steer_rx on all run_prompt_task exit paths (#1391) (10aaa72f0)
• Restore channel date divider rule (#1395) (0827171d5)
• Speed up profile wave action (#1379) (2fc5dd35b)
• Restore visible links for rich previews (#1378) (8d8fc6331)
• Mobile channel list polish (#1367) (09d8965ab)
• style(desktop): unify corner radii to rounded-2xl (16px) (#1393) (2f496debc)
• fix(desktop): skip keychain write when blob contents are unchanged (#1377) (5a64ee4a6)
• fix(desktop): stop clipping the agent-activity row under the composer (#1371) (2044ad76f)
• Constrain macOS overscroll to conversations (#1317) (9b711f47a)
• Mobile appearance foundation (#1366) (945e9b879)