v0.7.4 — Custom Endpoints & Session Branching Overhaul

Features

• Custom endpoint support — connect any OpenAI-compatible provider via Pi SDK's registerProvider, with protocol selector, base URL input, and model registration. Fixes #329 (479d6d25)

Improvements

• Custom endpoint UX — protocol selector now appears before the base URL input, and edit-state persistence works reliably across setup routing (aac754d7, d94d36bd, 40b53170)
• CustomEndpointApi cleanup — deduplicated type definition, extracted InitMessage, and fixed model registration replace bug (8f770f62)

Bug Fixes

• Session branching overhaul — completely reworked the branch/fork flow to eliminate preflight failures, CWD mismatches, and stuck sessions. Branches now fork on first user message instead of during preflight, conversation is properly trimmed at the branch point, and spawn_session names appear correctly in the sidebar. Fixes #392 (a9358817, 1cb1d11c, d337e288, e54f58f0, 0d40bb7e, 7bd83366, 36f46f88, e8db3e2a, and 10 more commits)
• Branch cutoff reliability — Pi and Claude branch cutoffs now use sidecar turn anchors and lineage guards, with proper fallback when UUIDs are missing (ebf0fba7, 20f1dc35, 82b19359, 4bfac3a0)
• Windows: duplicate messages on branch — Windows fs.watch() fires aggressively for atomic writes, causing the ConfigWatcher to re-broadcast session metadata and duplicate messages. Fixed with ID-based dedup in appendMessage(), self-triggered event suppression via signature comparison, and increased debounce to 300ms on Windows (65c959f8)
• Windows: empty branch messages — branch messages were saved with hardcoded source session paths instead of portable {{SESSION_PATH}} tokens, causing path resolution failures on Windows. Fixed by re-tokenizing paths from source → branch directory during message copy (1ab2c9b8)
• Model switching mid-session — ClaudeAgent.setModel now correctly calls super.setModel to update the internal model reference, fixing cases where model changes didn't take effect. Partially addresses #390 (abd1fa4a)
• JSON file link crash — clicking JSON file links for non-existent files no longer crashes the app (bfcb875d)
• Empty text block cache_control — stripped cache_control from empty text blocks in Anthropic API requests, preventing validation errors (4ad37ff3)
• Automation send-timeout — increased send-timeout for the daily discussion points workflow to prevent premature timeouts (669c83cb)