muninkit: remove Sourcery, promote hand-written Equatable

Swift 6.3's Equatable synthesis covers every AutoEquatable conformer
that doesn't need ulp-tolerant Double comparison or explicit field
exclusion. Drop Sourcery, its templates, the Autogenerated/ dir, and
the AutoEquatable / Diffable marker protocols — the stencil had no
exclusion mechanism anyway, and the last two commits (§14 self-heal
and §15 jpegCompression fingerprint) both hand-edited the generated
file. Stop pretending it's generated.

Hand-written Equatable stays for the three types that actually need
it, now living in Sources/MuninKit/Equality.swift:

- Photo: deliberately excludes modifiedDate/fileSize (cache keys) and
  next/previous (derived navigation), deliberately includes sourceHash
  and encodingFingerprint. Same semantics as before — PhotoEqualityTests
  locks every exclusion.
- GPS, LocationDegree: use `==~` (ulp-tolerant) for their Double
  fields because EXIF reads can drift bitwise on a photo whose bytes
  are otherwise unchanged.

Album, Keyword, LocationData, Parent, ScaledPhoto get synthesized
member-by-member `==` via their declared Hashable / Equatable
conformance. The stencil used to emit a field-by-field guard chain —
semantically identical to synthesis.

Also drops `make generate`, the `sourcery` Brewfile entry, the
`exclude: ["Templates"]` hack on the MuninKit target, and FUTURES.md
§7.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: kradalby

.sourcery.yml

@@ -2,7 +2,6 @@
 brew 'swift'
 brew 'swiftlint'
 brew 'swift-format'
-brew 'sourcery'
 
 # Dependencies
 brew 'gd'

Brewfile

@@ -106,27 +106,7 @@ Good next steps:
 
 ---
 
-## 7. Remove Sourcery / `Autogenerated/` code generation
-
-`Sources/MuninKit/Autogenerated/Equality.generated.swift` (and the
-corresponding `Diffable.generated.swift`) are generated by Sourcery from
-`Sources/MuninKit/Templates/*.stencil`. They contain hand-tuned `Equatable`
-behaviour (notably, Photo's `==` excludes the `next` / `previous`
-navigation fields — see commit 18).
-
-With Swift 6.3, `Equatable` synthesis is essentially complete, and the
-diff algorithm could be rewritten on top of synthesized `==` plus an
-explicit list of "fields that participate in diff". Removing Sourcery
-would eliminate a codegen step and one more third-party tool from the
-development environment.
-
-This is deliberately out of scope for the Swift 6 migration because
-changes to the generated `Equatable` will change the observable output of
-the diff pipeline, and regression-testing that shift is its own project.
-
----
-
-## 8. Nix + Swift packaging
+## 7. Nix + Swift packaging
 
 `flake.nix` intentionally does not provide a Swift toolchain because
 nixpkgs' Swift derivations trail Swift.org releases and interact awkwardly

FUTURES.md

@@ -4,10 +4,6 @@ install: build-release
 publish: build
 	scp ./.build/release/munin root@storage.terra.fap.no:/storage/nfs/k8s/builds/munin/.
 
-generate:
-	sourcery
-	make fmt
-
 build:
 	swift build -c debug
 

Makefile

@@ -71,8 +71,7 @@ let package = Package(
         .product(name: "SystemPackage", package: "swift-system"),
         .product(name: "Crypto", package: "swift-crypto"),
         "SwiftExif",
-      ],
-      exclude: ["Templates"]
+      ]
     ),
     .testTarget(
       name: "MuninTests",

Package.swift

@@ -7,7 +7,7 @@
 
 import Foundation
 
-struct Album: Hashable, Comparable, Diffable, Sendable {
+struct Album: Hashable, Comparable, Sendable {
   var name: String
   var url: String
   var path: String
@@ -92,7 +92,7 @@ struct AlbumInAlbum: Codable, Sendable {
   var scaledPhotos: [ScaledPhoto]
 }
 
-struct Parent: Codable, AutoEquatable, Comparable, Sendable {
+struct Parent: Codable, Equatable, Comparable, Sendable {
   var name: String
   var url: String
 
@@ -139,7 +139,7 @@ extension Album: Decodable {
   }
 }
 
-extension Album: AutoEquatable {
+extension Album {
   static func < (lhs: Album, rhs: Album) -> Bool {
     return lhs.name < rhs.name
   }