Build each crate's integration tests as one binary

Every tests/*.rs file is its own executable that links the whole crate
graph. Move each crate's test files into tests/it/ as modules of one
tests/it/main.rs; helper modules under tests/common move with them.

These keep their own binary (own process):
- engine panic_hunt: a process-wide panic hook counts every panic.
- engine text_gamma: changes the process-wide text gamma.
- engine smart_filter_stages, mask_cache_purge: assert on global caches.
- codecs pnm_peak_memory: reads the process's peak RSS.
- photocraft mac_menu_appkit: harness = false.

crates/affinity/tests/it/main.rs

@@ -0,0 +1,4 @@
+//! The crate's integration tests, linked into one test binary.
+
+mod compound_limits;
+mod real_files;

crates/algo/tests/it/main.rs

@@ -0,0 +1,5 @@
+//! The crate's integration tests, linked into one test binary.
+
+mod liquify_source_footprint;
+mod retouch_blur_exact;
+mod warp_clipped;

crates/automation/tests/it/main.rs

@@ -0,0 +1,16 @@
+//! The crate's integration tests, linked into one test binary.
+
+mod agent_tasks;
+mod agent_tasks_extended;
+mod agent_tasks_more;
+mod bridge;
+mod inactive_save;
+mod krita;
+mod layered_save_dirty;
+mod mcp;
+mod mcp_wire;
+mod missing_font_warnings;
+mod native_save_name;
+mod openraster;
+mod raw_defaults;
+mod smart_filter_authorization;

crates/cms/tests/it/main.rs

@@ -0,0 +1,6 @@
+//! The crate's integration tests, linked into one test binary.
+
+mod bench;
+mod cms;
+mod gpu_matrix_shaper;
+mod regen;

crates/codecs/tests/it/decode_warnings.rs

@@ -1,7 +1,7 @@
 //! Decode warnings: a file that holds more than was decoded (#523: animations, multi-page
 //! TIFF) or less than it should (#518: truncated JPEG) says so; complete single images don't.
 
-mod common;
+use crate::common;
 use common::*;
 use photocraft_codecs::*;
 

crates/codecs/tests/it/detect_caps.rs

@@ -1,7 +1,7 @@
 //! Magic-number detection, extensions, and the capability table
 //! (including the symmetric read/write guarantee).
 
-mod common;
+use crate::common;
 use common::*;
 use photocraft_codecs::*;
 

crates/codecs/tests/it/fidelity.rs

@@ -1,6 +1,6 @@
 //! `fidelity_warnings` cases, and consistency with what `encode` does.
 
-mod common;
+use crate::common;
 use FidelityWarning as W;
 use common::*;
 use photocraft_codecs::*;

crates/codecs/tests/it/heif.rs

@@ -8,7 +8,7 @@
 
 #![cfg(all(feature = "corpus", feature = "heif"))]
 
-mod common;
+use crate::common;
 use common::*;
 use photocraft_codecs::*;
 use std::sync::LazyLock;

crates/codecs/tests/it/limits.rs

@@ -1,6 +1,6 @@
 //! Decompression-bomb guards.
 
-mod common;
+use crate::common;
 use common::*;
 use photocraft_codecs::*;
 

crates/codecs/tests/it/main.rs

@@ -0,0 +1,35 @@
+//! The crate's integration tests, linked into one test binary.
+
+mod camera_raw;
+mod common;
+mod dds;
+mod dds_write;
+mod decode_warnings;
+mod deep_exr;
+mod detect_caps;
+mod dpx;
+mod exr_cryptomatte;
+mod exr_multipart;
+mod fidelity;
+mod gif_frames;
+mod heif;
+mod limits;
+mod malformed;
+mod metadata;
+mod orientation;
+mod pcx;
+mod png_jpeg;
+mod pnm_headers;
+mod resolution;
+mod roundtrip;
+mod source_settings;
+mod tga;
+mod tiff_bench;
+mod tiff_exif;
+mod tiff_lab;
+mod tiff_pages;
+mod tiff_photoshop;
+mod tiff_regressions;
+mod webp_frames;
+mod webp_lossy;
+mod xpm;

crates/codecs/tests/it/malformed.rs

@@ -1,6 +1,6 @@
 //! Malformed input must produce errors, never panics or huge allocations.
 
-mod common;
+use crate::common;
 use common::*;
 use photocraft_codecs::*;
 use proptest::prelude::*;

crates/codecs/tests/it/metadata.rs

@@ -1,6 +1,6 @@
 //! ICC / EXIF / XMP / DPI / text preservation, per format, per caps.
 
-mod common;
+use crate::common;
 use common::*;
 use photocraft_codecs::*;
 

crates/codecs/tests/it/orientation.rs

@@ -1,7 +1,7 @@
 //! EXIF / TIFF orientation (#285): files are opened upright, and every export
 //! writes Orientation = 1 so the upright pixels are never rotated twice.
 
-mod common;
+use crate::common;
 use common::*;
 use photocraft_codecs::*;
 use proptest::prelude::{any, prop_assert, prop_assert_eq, proptest};

crates/codecs/tests/it/png_jpeg.rs

@@ -1,7 +1,7 @@
 //! Format-specific behaviour: Adam7 PNG, JPEG colour models, oracle
 //! cross-checks against the `image` crate, and the optional PngSuite corpus.
 
-mod common;
+use crate::common;
 use common::*;
 use photocraft_codecs::*;
 

crates/codecs/tests/it/roundtrip.rs

@@ -2,7 +2,7 @@
 //! Lossless formats must reproduce the (planned) conversion of the input
 //! exactly; lossy formats must stay above a PSNR threshold.
 
-mod common;
+use crate::common;
 use common::*;
 use photocraft_codecs::*;
 

crates/codecs/tests/it/source_settings.rs

@@ -1,7 +1,7 @@
 //! Reading back the settings a lossy file was saved with: a JPEG's quality from its
 //! quantisation tables, a WebP's lossy or lossless encoding (and its quality).
 
-mod common;
+use crate::common;
 use common::*;
 use photocraft_codecs::*;
 

crates/codecs/tests/it/tiff_bench.rs

@@ -5,7 +5,7 @@
 //! cargo test --release -p photocraft-codecs --test tiff_bench -- --ignored --nocapture
 //! ```
 
-mod common;
+use crate::common;
 use common::tiffgen::*;
 use photocraft_codecs::*;
 use std::time::Instant;

crates/codecs/tests/it/tiff_pages.rs

@@ -4,7 +4,7 @@
 //! offsets past the end, absurd sizes) that must give `Ok` or a clean `Err`, never a panic.
 //! Every file here is hand-built by `common::tiffgen`.
 
-mod common;
+use crate::common;
 use common::Rng;
 use common::tiffgen::*;
 use photocraft_codecs::*;

crates/codecs/tests/it/tiff_photoshop.rs

@@ -2,7 +2,7 @@
 //! `Metadata` as opaque bytes: written when present, read from either byte order and from
 //! BigTIFF, and never a panic or an allocation on malformed input.
 
-mod common;
+use crate::common;
 use common::*;
 use photocraft_codecs::*;
 

crates/codecs/tests/it/tiff_regressions.rs

@@ -1,4 +1,4 @@
-mod common;
+use crate::common;
 
 use common::tiffgen::*;
 use photocraft_codecs::{Image, decode, exif_orientation, upright_exif};

crates/codecs/tests/it/webp_lossy.rs

@@ -3,7 +3,7 @@
 //! smaller than lossless on photographic content; alpha and metadata travel in the container;
 //! odd sizes and the limits behave.
 
-mod common;
+use crate::common;
 use common::*;
 use photocraft_codecs::*;
 

crates/engine/tests/it/current_affinity_artboards.rs

@@ -1,7 +1,7 @@
 //! Artboards recognized from current .af properties move with their children and undo together.
 #![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
 
-#[path = "../../io/tests/support/current_affinity.rs"]
+#[path = "../../../io/tests/support/current_affinity.rs"]
 mod fixture;
 
 use fixture::{Marker, document};