fix: resolve the conflict markers #7786's merge shipped in release_source.rs

My resolution of #7786's rebase missed a fourth conflicted file; the markers
landed on main and broke the perry bin build. All three blocks take #7786's
side — the one-spelling-per-source policy its own doc block states. Verified:
cargo check -p perry clean.

Claude-Session: https://claude.ai/code/session_01Y1QZ5wUP9gRSwpiweT4Wix

Author: Ralph Küpper

crates/perry/src/release_source.rs

@@ -73,11 +73,6 @@ pub(crate) enum CheckSource {
 
 /// Parse a configured `source` name into a source, given the other keys.
 ///
-<<<<<<< HEAD
-/// Returns `None` for a name this build does not know, so the caller can fall
-/// back rather than fail — a config written by a newer Perry must not break an
-/// older one's update check.
-=======
 /// One spelling per source, deliberately: a set of accepted aliases is a
 /// surface to keep documented and tested forever in exchange for saving one
 /// lookup in the docs.
@@ -86,7 +81,6 @@ pub(crate) enum CheckSource {
 /// to the default rather than refusing to check at all. That is not a
 /// compatibility affordance — it is that an update check is the wrong place to
 /// turn a config typo into a hard failure.
->>>>>>> 373f3fdd1 (feat(cli): hold back brand-new releases, remember a skipped version, and document the whole surface)
 pub(crate) fn from_config(
     source: Option<&str>,
     package: Option<&str>,
@@ -95,28 +89,16 @@ pub(crate) fn from_config(
 ) -> Option<CheckSource> {
     let package = || package.unwrap_or(PERRY_NPM_PACKAGE).to_string();
     match source?.trim().to_ascii_lowercase().as_str() {
-<<<<<<< HEAD
-        "gh-releases" | "github" => Some(CheckSource::GhReleases {
-=======
         "gh-releases" => Some(CheckSource::GhReleases {
->>>>>>> 373f3fdd1 (feat(cli): hold back brand-new releases, remember a skipped version, and document the whole surface)
             url: server
                 .unwrap_or(super::update_checker::GITHUB_URL)
                 .to_string(),
         }),
-<<<<<<< HEAD
-        "npm" | "npm-registry" => Some(CheckSource::Npm {
-            package: package(),
-            registry: registry.unwrap_or(NPM_REGISTRY).to_string(),
-        }),
-        "gh-registry" | "github-packages" => Some(CheckSource::GhRegistry {
-=======
         "npm" => Some(CheckSource::Npm {
             package: package(),
             registry: registry.unwrap_or(NPM_REGISTRY).to_string(),
         }),
         "gh-registry" => Some(CheckSource::GhRegistry {
->>>>>>> 373f3fdd1 (feat(cli): hold back brand-new releases, remember a skipped version, and document the whole surface)
             package: package(),
             registry: registry.unwrap_or(GH_REGISTRY).to_string(),
         }),