[danjdewhurst]

Fixes the findings from a full repo review. No new features — performance, correctness, and honesty cleanups, plus CI.

Performance & correctness

• Render previews off the main actor: renderPreviewIfNeeded now runs the expensive CIContext rasterization and histogram build in a detached task; only debounce, generation checks, and state publishing stay on the MainActor. Previously the whole render ran on the main thread and blocked the UI during edits.
• Grain size was inverted: noise is now scaled by size instead of 1/size, so larger grain sizes produce coarser grain.
• Color pipeline precision: sources load as half-float (.RGBAh) instead of 8-bit, and the default extended_linear_srgb working space now maps to the extended linear sRGB color space instead of gamma-encoded extended sRGB.
• Histogram clipping counts a pixel only when all channels clip, so saturated colors no longer over-report shadow/highlight clipping.
• Import no longer double-decodes: photos are validated with a cheap ImageIO check on import/relink; the full decode happens once when the item is applied.
• openProject sets the project's selected item, so edits to the auto-selected photo persist without manually reselecting it.
• Export name preview is formatted without probing the filesystem (it previously ran fileExists checks against /tmp from the view body and could show a misleading -2 suffix).
• Preview cache is bounded by ~256 MB of estimated pixel bytes in addition to the existing 8-entry limit.
• Stale-index crash risk in the Local inspector section: layer reads go through a guarded accessor and binding setters validate indices.

Cleanup

• Removed the inaccessible .sideBySide comparison mode (it was hidden from the UI via a custom allCases override and rendered the split view anyway); README updated to match.
• Removed the *CoverageProbe enums from production view code and the coverage ignore-regex from script/test.sh, so reported coverage no longer excludes the largest source files.
• Consolidated the duplicated batch-export state construction into shared helpers used by both the async and synchronous drivers.
• Labeled the derived calibration readouts as preview placeholders in the inspector.

CI

• Added .github/workflows/ci.yml running swift build and ./script/test.sh on macos-15.

Notes for review

This branch was authored in a Linux environment without a Swift toolchain, so it has not been compiled locally — the new CI workflow on this PR is the first build. Two changes intentionally alter observable behavior that tests don't pin and deserve a quick visual check: grain size direction and the clipping ratios.

https://claude.ai/code/session_018WfrSbcryCLDHBqAQHawki

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 57058347-bef2-464f-8972-613205bec500

📥 Commits

Reviewing files that changed from the base of the PR and between 8d662c2 and 6ff5791.

📒 Files selected for processing (14)

• .github/workflows/ci.yml
• README.md
• Sources/FilmChefCore/Models/EditorModels.swift
• Sources/FilmChefCore/Services/FilmPipelineRenderer.swift
• Sources/FilmChefCore/Services/ImageProcessor.swift
• Sources/FilmChefCore/Stores/EditorStore+ExportNaming.swift
• Sources/FilmChefCore/Stores/EditorStore.swift
• Sources/FilmChefCore/Views/ContentView.swift
• Sources/FilmChefCore/Views/ControlsView.swift
• Sources/FilmChefCore/Views/HistogramView.swift
• Sources/FilmChefCore/Views/PreviewPaneView.swift
• Sources/FilmChefCore/Views/SidebarView.swift
• Tests/FilmChefCoreTests/main.swift
• script/test.sh

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