Buzz Desktop v0.4.20

• fix(desktop): composite harness loader opacity (#2180) (77900e69)
• fix(desktop): modal sign-in + branded communities onboarding page (#2147) (8a65d81f)
• test(desktop): model membership relay in invite QR spec (#2178) (9ab52d4f)
• fix(desktop): prefer live agent mentions (#2149) (a4dfead2)
• fix(desktop): close focused threads on Escape (#2154) (9fb1a90b)
• fix: skip membership lookup for open relays (#2107) (fc1db469)
• fix(desktop): make invite QR downloadable (#2168) (144b4f6c)
• Archive managed agents when deleted (#2135) (4d58deaf)
• chore(deps): update rust crate rustls to v0.23.42 (#2151) (984645ec)
• Add Agent Config Core: harness capability model behind agent config surfaces (#2158) (6881a337)
• fix(desktop): derive default clone URL for relay-hosted repos (#2166) (21dbd326)
• fix(desktop): mask composer rounded corners (#2165) (8024ce72)
• feat(desktop): add PR merge conflict recovery (#2164) (4fe3835e)
• fix(desktop): mask scrolled content behind channel and thread composers (#2163) (6ecc8946)
• feat(desktop): add inline PR diff comments (#2162) (73ac59a0)
• feat(desktop): add commit-scoped PR review decisions (#2161) (de2220a7)
• fix(desktop): batch project work item queries (#2160) (ba07de36)
• feat(desktop): make missing project checkouts actionable (#2159) (ac8c5261)
• Fix harness default model states in onboarding (#2156) (a6432ab1)
• Reduce agent config flags to canonical behaviors + disclosure presets (#2148) (ad990b0d)
• fix(desktop): align inbox layout and draft details (#2143) (7f769b24)
• fix(desktop): scope Emacs keys to lines (#2127) (9a251fbe)
• feat(desktop): add fuzzy onboarding cards (#2141) (e84f3fe8)
• Add back action to community profile onboarding (#2136) (1342fc56)
• fix(desktop): restore channel header hidden behind shared backdrop (#2139) (916c67d1)
• refactor(desktop): rename agent config files to agent-config family (#2140) (c5db0943)
• feat(desktop): complete project git workflows (#2119) (ed432f91)
• Add owned community onboarding (#2123) (cd0e7402)
• Improve agent runtime settings (#2026) (2b0f5e9f)
• fix(desktop): refine onboarding copy (#2130) (d04a4c97)
• fix(ui): relabel agent owner attribution from "owned by" to "managed by" (#2133) (a1e977cd)
• remove relay field from invite link step (#2131) (3881bff6)
• Polish onboarding avatar capture (#2118) (46a63a86)