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Local development snapshot of one session's intertwined workstreams. Committed together because changes span shared files (provider.go, model.go, loop.go, types.go, streamjson) and can't be cleanly split without interactive hunk staging. Build + vet + full -race suite green. Zenline TUI skin: Zen home / Statusline chat / permission-modal surfaces, 5 themes (Phosphor/Cyan/Sage/Violet/Mono), boot splash, mouse support, and a headless --snapshot mode (internal/zenline, cli/zenline.go, tui/zenline_view.go). OpenAI provider: streaming tool-call accumulation hardening plus an idle-timeout watchdog (reader goroutine + context cancel) so a stalled upstream surfaces an error instead of hanging the agent forever. Agent reliability: update_plan schema makes id optional/auto-numbered with an advertised item schema; malformed (nameless) tool calls feed a retry to the model instead of silently ending the turn; secret scrubbing at the registry boundary (covers agent loop AND MCP); structured ToolResult (changedFiles/display/redacted) surfaced via stream-json. Session file checkpoints + safe rewind: before-mutation content snapshots (content-addressed, deduped, size-capped, 0600) captured on write/edit/apply_patch in TUI and headless; RestoreToSequence + ApplyRewind (path-traversal-guarded, session-locked); /rewind in TUI and 'zero sessions rewind' headless; stream-json checkpoint/restore events. Design specs under docs/superpowers/specs/. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>