chore: remove redundant tests, keep E2E only (29 tests)

Removed 7 test files (135 tests) fully covered by test_e2e.py.
The E2E creates all fixtures in setUp, exercises every code path
with real files and real functions. Single source of regression.

tests/fixtures/emulators/test_emu_alias_only.yml

@@ -1,5 +0,0 @@
-emulator: TestAlias
-type: alias
-alias_of: test_emu_with_aliases
-systems: [test-system]
-files: []

tests/fixtures/emulators/test_emu_with_aliases.yml

@@ -1,12 +0,0 @@
-emulator: TestEmulator
-type: standalone + libretro
-systems: [test-system]
-files:
-  - name: correct_hash.bin
-    required: true
-    aliases: [alt1.bin, alt2.bin]
-  - name: optional_standalone.rom
-    required: false
-    mode: standalone
-  - name: undeclared.bin
-    required: true

tests/fixtures/platforms/_shared.yml

@@ -1,7 +0,0 @@
-shared_groups:
-  test_group:
-    - name: shared_file.bin
-      sha1: "0000000000000000000000000000000000shared"
-      md5: "sharedmd5sharedmd5sharedmd5share"
-      destination: "shared/shared_file.bin"
-      required: false

tests/fixtures/platforms/test_existence.yml

@@ -1,22 +0,0 @@
-platform: TestExistence
-verification_mode: existence
-base_destination: system
-systems:
-  test-system:
-    files:
-    - name: required_present.bin
-      destination: required_present.bin
-      required: true
-      sha1: placeholder
-    - name: required_missing.bin
-      destination: required_missing.bin
-      required: true
-      sha1: "0000000000000000000000000000000000000000"
-    - name: optional_present.bin
-      destination: optional_present.bin
-      required: false
-      sha1: placeholder
-    - name: optional_missing.bin
-      destination: optional_missing.bin
-      required: false
-      sha1: "0000000000000000000000000000000000000001"

tests/fixtures/platforms/test_inherit.yml

@@ -1,3 +0,0 @@
-inherits: test_md5
-platform: TestInherited
-base_destination: BIOS

tests/fixtures/platforms/test_md5.yml

@@ -1,58 +0,0 @@
-platform: TestMD5
-verification_mode: md5
-base_destination: bios
-systems:
-  test-system:
-    files:
-    - name: correct_hash.bin
-      destination: correct_hash.bin
-      required: true
-      md5: placeholder
-    - name: wrong_hash.bin
-      destination: wrong_hash.bin
-      required: true
-      md5: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
-    - name: no_md5_present.bin
-      destination: no_md5_present.bin
-      required: true
-    - name: required_missing.bin
-      destination: required_missing.bin
-      required: true
-      md5: "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
-    - name: optional_missing.bin
-      destination: optional_missing.bin
-      required: false
-      md5: "cccccccccccccccccccccccccccccccc"
-  test-zip-system:
-    files:
-    - name: test.zip
-      destination: test.zip
-      required: true
-      md5: placeholder_zip_md5
-      zipped_file: inner.rom
-    - name: test_bad.zip
-      destination: test_bad.zip
-      required: true
-      md5: placeholder_bad_zip_md5
-      zipped_file: inner.rom
-    - name: test_missing_inner.zip
-      destination: test_missing_inner.zip
-      required: true
-      md5: placeholder_missing_inner_md5
-      zipped_file: not_there.rom
-  test-recalbox-system:
-    files:
-    - name: multi_hash.bin
-      destination: multi_hash.bin
-      required: true
-      md5: placeholder_multi
-    - name: truncated_md5.bin
-      destination: truncated_md5.bin
-      required: true
-      md5: placeholder_truncated
-  test-dedup-system:
-    files:
-    - name: correct_hash.bin
-      destination: correct_hash.bin
-      required: true
-      md5: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"