Chore: Improve compatibility for future

[Meldiron]

No description provided.

[greptile-apps]

Greptile Summary

This chore PR makes three small improvements to the Gitea adapter and its tests: (1) generalizes two exception messages in Gitea.php from naming "Gitea" explicitly to saying "this adapter", (2) centralizes the hardcoded 'main' default-branch string across GiteaTest.php into a single $defaultBranch static property, and (3) removes redundant ?? '' null-coalescing suffixes after System::getEnv() calls that already supply a non-null default (the library's PHPDoc template guarantees a string return when a non-null default is given).

• The ?? '' removal in GiteaTest.php and Base.php is safe: System::getEnv(string $name, ?string $default = null): ?string with a non-null default is statically annotated to return string (non-nullable), making the coalescing redundant.
• The $defaultBranch consolidation is a useful refactor, but the property is hardcoded to 'main' and never read from an environment variable or queried from the live Gitea server. If the test infrastructure uses a different default branch, tests will still break — limiting the stated "future compatibility" benefit. Consider reading the value from an env var (e.g. TESTS_GITEA_DEFAULT_BRANCH) at setup time.

Confidence Score: 4/5

• Safe to merge — all changes are cosmetic or test-only; no production logic is affected beyond two error message strings.
• The production change (genericized error messages) is trivial. The test changes correctly eliminate redundant null-coalescing and centralize the default branch string. The only concern is that the new $defaultBranch property is still hardcoded to 'main' rather than being environment-driven, which partially undermines the "future compatibility" goal but does not break anything in the current setup.
• tests/VCS/Adapter/GiteaTest.php — the $defaultBranch property should ideally be populated dynamically if true portability across different Gitea configurations is desired.

Important Files Changed

Filename	Overview
src/VCS/Adapter/Git/Gitea.php	Two exception messages generalized from "Gitea adapter"/"Gitea" to "this adapter" — trivial cosmetic change with no functional impact.
tests/VCS/Adapter/GiteaTest.php	Replaces all hardcoded 'main' branch strings with static::$defaultBranch and removes redundant ?? '' null-coalescing patterns after System::getEnv() calls with non-null defaults. The $defaultBranch property is initialized to 'main' but is never dynamically populated (e.g. from an env var or the server), which limits the stated future-compatibility goal.
tests/VCS/Base.php	Removes two redundant ?? '' null-coalescing suffixes after System::getEnv() calls that already supply non-null defaults — safe cleanup.

_{Reviews (1): Last reviewed commit: "Upgrade deps" | Re-trigger Greptile}