refactor(seld-json-lint): extract seld/json_lint into the shirabe-seld-json-lint crate

Move `Seld\JsonLint` out of shirabe-external-packages and into its own
crate, so the path is `shirabe_seld_json_lint::ParsingException` instead
of `shirabe_external_packages::seld::json_lint::ParsingException`.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/crates/shirabe-seld-json-lint/src/lib.rs b/crates/shirabe-seld-json-lint/src/lib.rs
new file mode 100644
index 00000000..2165c8f2
--- /dev/null
+++ b/crates/shirabe-seld-json-lint/src/lib.rs
@@ -0,0 +1,15 @@
+//! Partial port of seld/jsonlint.
+//!
+//! The parser, lexer, and duplicate-key exception (`JsonParser`, `Lexer`,
+//! `DuplicateKeyException`) are intentionally not ported: JSON syntax validation now relies on
+//! serde_json, and duplicate-key detection is done with a hand-written serde visitor, so
+//! jsonlint's own parsing machinery is no longer needed.
+//!
+//! `ParsingException` is kept because it is the exception type thrown for invalid JSON and is
+//! matched (via downcast) across the codebase as an error-kind signal; it also carries detail
+//! such as the error line. Porting it keeps both the thrown exception class and the information
+//! it carries unchanged.
+
+pub mod parsing_exception;
+
+pub use parsing_exception::*;