docs: remove duplicate v0.7.7 release note

Author: loadingalias

CHANGELOG.md

@@ -1,23 +1,15 @@
 # Changelog
 
-
 `0.6.3` and the `0.7.0` through `0.7.6` entries below record unpublished
 release candidates. `0.7.4` was prepared but never tagged.
 
-
-
 ## [0.7.7](https://github.com/loadingalias/rscrypto/compare/v0.7.6...v0.7.7) - 2026-07-15
 
 - Hardened release finalization so signed tags require successful exact-commit CI,
   Cargo graph assurance, constant-time evidence, and RSA evidence. Adopted
   cargo-rail 0.17.3 for recoverable release pushes and isolated fast-hash
   allocation accounting from parallel test-harness threads.
 
-### 📦 Other Changes
-
-- isolate allocation checks from harness threads ([27eb73d](https://github.com/loadingalias/rscrypto/commit/27eb73db5bacae83c031b8e84ea1b49be876c109))
-
-
 ## [0.7.6](https://github.com/loadingalias/rscrypto/compare/v0.7.5...v0.7.6) - 2026-07-15
 
 - Bound promoted CT manifest and tool-lock hashes to the recorded evidence commit instead of the release commit's version-only lockfiles.