codegen: Remove flaky license auto-detection

tools/manifest-schema/CHANGELOG.md

@@ -10,6 +10,8 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+- Remove no longer used `Manifests::license_markdown`.
+
 ## [0.2.0] - 2026-03-20
 
 - Rename `ManifestDownloadInfo::checksum` field to `hash` to reduce manifest size.

tools/manifest-schema/src/lib.rs

@@ -200,8 +200,6 @@ impl<'de> Deserialize<'de> for Version {
 pub struct Manifests {
     pub rust_crate: Option<String>,
     pub template: Option<ManifestTemplate>,
-    /// Markdown for the licenses.
-    pub license_markdown: String,
     #[serde(flatten)]
     pub map: BTreeMap<Reverse<Version>, ManifestRef>,
 }