Remove all special-casing for local version identifiers (#8818)

## Summary

After #8797, we have spec-compliant
handling for local version identifiers and can completely remove all the
special-casing around it.

crates/uv-requirements/src/lookahead.rs

@@ -18,7 +18,7 @@ use crate::{required_dist, Error};
 /// A resolver for resolving lookahead requirements from direct URLs.
 ///
 /// The resolver extends certain privileges to "first-party" requirements. For example, first-party
-/// requirements are allowed to contain direct URL references, local version specifiers, and more.
+/// requirements are allowed to contain direct URL references.
 ///
 /// The lookahead resolver resolves requirements recursively for direct URLs, so that the resolver
 /// can treat them as first-party dependencies for the purpose of analyzing their specifiers.

crates/uv-resolver/src/manifest.rs

@@ -106,7 +106,6 @@ impl Manifest {
     /// - Determining which requirements should allow yanked versions.
     /// - Determining which requirements should allow pre-release versions (e.g., `torch>=2.2.0a1`).
     /// - Determining which requirements should allow direct URLs (e.g., `torch @ https://...`).
-    /// - Determining which requirements should allow local version specifiers (e.g., `torch==2.2.0+cpu`).
     pub fn requirements<'a>(
         &'a self,
         env: &'a ResolverEnvironment,