chore(release): release version 0.3.26

[wpfleger96]

Release v0.3.26

Changes since v0.3.25:

• ci: cache Flutter pub packages in the Mobile job (#1128) (ceb5eff53)
• Delete RESEARCH directory (a1d5570d3)
• feat(cli): support ephemeral channels via --ttl on create/update (#1126) (4f671a255)
• fix(justfile): suppress grep exit code in release changelog formatter (d40c86626)
• fix(desktop): single-owner anchored scroll for dynamic loading (#1115) (047db4214)
• fix(buzz-dev-mcp): resolve non-WSL bash so the MCP shell works on Windows (#1119) (4d2eb52a6)
• ci: key main-push concurrency group on SHA to stop run eviction (#1124) (e99105edc)
• fix(desktop): seed up agent JSON files in sync_shared_agent_data (#1121) (065625bb4)
• fix(acp): emit per-section prompt blocks so observer counts every section (#1122) (a1cf1db67)
• refactor(justfile): rename, relay auto-start, bootstrap, DRY cleanup (#1117) (1dc4fb5da)
• fix(desktop): keep active-turn badges through transient relay drops (#1120) (cf122fcf1)
• Polish desktop sidebar navigation (#1107) (7072281f6)
• fix(desktop): collapse thread-unread badge on thread-open (#1118) (0176d5f31)
• feat(desktop): unify unread pills into one shared UnreadPill component (#1111) (826945e1b)
• fix(cli): use relay workflow id on create (#872) (762ca43d2)
• Fold agent core memory into the session system prompt (#1112) (633544788)
• feat(cli): add patches and issues commands for NIP-34 git collaboration (#1073) (cd8292fe9)
• fix(desktop): stop random timeline message loss + page reconnect replay (#1105) (0181603eb)
• Update README.md (c338d8840)
• fix(desktop): keep thread replies from scrolling channel (#1109) (d24eac61a)
• fix(buzz-acp): accept siblings under allowlist author gate (#1108) (dd9ce0902)
• feat(deploy): add production Helm chart for Buzz (#990) (629fb57bf)
• fix(desktop): keep MembersSidebar input usable while an add is in flight (#1106) (aadbe6735)

To release: merge this PR. The tag and build will happen automatically.