[bytenik]

Changeset files generated by the JavaScript tooling quote package names, such as "@scope/package": patch. The parser currently keeps those delimiters in PackageName, so consumers cannot match these entries to the package's unquoted name.

Strip one matching pair of single or double quotes when parsing package names. Quoted and unquoted entries then contribute to the same release. Consume front-matter lines independently of the number of unique package names so duplicate normalized keys preserve the summary and retain last-entry-wins behavior.

This changes the parsed names exposed by the public API. A major changeset documents the compatibility change, and the format documentation describes quoted names.

Follows the parser-level fix suggested in knope-dev/knope#2051 (comment).

Validation:

• All 12 tests pass with cargo test --locked.
• The quoted-name and normalized-duplicate regressions fail against the original parser.
• cargo clippy --locked --all-targets -- -D warnings, cargo +nightly fmt --check, and git diff --check pass.