feat(p10-1a-1): kebab-parse-code crate (lang + repo + skip)

Tasks 5-8: new `kebab-parse-code` crate with three infrastructure modules
for the code ingest framework. Ships lang.rs (extension→language identifier
mapping), repo.rs (.git walk-up via gix 0.70 for RepoMeta), and skip.rs
(BUILTIN_BLACKLIST, is_generated_file, is_oversized). 14 integration tests
across three test files, all passing; clippy -D warnings clean.

Note: gix pinned to 0.70 (not 0.83 as originally suggested) because 0.83
fails to compile against Rust 1.94.1 due to non-exhaustive match patterns
in gix-hash. 0.70 resolves cleanly and has identical head_name/head_id API.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

crates/kebab-parse-code/tests/skip.rs

@@ -0,0 +1,74 @@
+use kebab_parse_code::skip::{BUILTIN_BLACKLIST, is_generated_file, is_oversized};
+use std::fs;
+use tempfile::NamedTempFile;
+
+#[test]
+fn generated_header_markers_trigger_skip() {
+    let cases = [
+        "// @generated\nfn foo() {}\n",
+        "// Code generated by tonic-build. DO NOT EDIT.\nfn x() {}\n",
+        "/* DO NOT EDIT */\nfn x() {}\n",
+        "/* do not modify */\nfn x() {}\n",
+        "// AUTOMATICALLY GENERATED\nfn x() {}\n",
+        "# auto-generated\ndef x(): pass\n",
+        "// autogenerated\nfn x() {}\n",
+    ];
+    for content in cases {
+        let f = NamedTempFile::new().unwrap();
+        fs::write(f.path(), content).unwrap();
+        assert!(is_generated_file(f.path()).unwrap(), "content: {content:?}");
+    }
+}
+
+#[test]
+fn normal_code_is_not_flagged_generated() {
+    let f = NamedTempFile::new().unwrap();
+    fs::write(f.path(), "fn main() {\n    println!(\"hi\");\n}\n").unwrap();
+    assert!(!is_generated_file(f.path()).unwrap());
+}
+
+#[test]
+fn is_generated_returns_false_for_empty_file() {
+    let f = NamedTempFile::new().unwrap();
+    fs::write(f.path(), "").unwrap();
+    assert!(!is_generated_file(f.path()).unwrap());
+}
+
+#[test]
+fn oversized_by_bytes_returns_true() {
+    let f = NamedTempFile::new().unwrap();
+    let body: String = "x".repeat(300_000);
+    fs::write(f.path(), &body).unwrap();
+    assert!(is_oversized(f.path(), 262_144, 5_000).unwrap());
+}
+
+#[test]
+fn oversized_by_lines_returns_true() {
+    let f = NamedTempFile::new().unwrap();
+    let body: String = "x\n".repeat(6_000);
+    fs::write(f.path(), &body).unwrap();
+    assert!(is_oversized(f.path(), 262_144, 5_000).unwrap());
+}
+
+#[test]
+fn small_file_returns_false_for_oversize() {
+    let f = NamedTempFile::new().unwrap();
+    fs::write(f.path(), "fn foo() {}\n").unwrap();
+    assert!(!is_oversized(f.path(), 262_144, 5_000).unwrap());
+}
+
+#[test]
+fn builtin_blacklist_has_exactly_six_entries() {
+    assert_eq!(BUILTIN_BLACKLIST.len(), 6);
+    let expected = [
+        "**/node_modules/**",
+        "**/target/**",
+        "**/__pycache__/**",
+        "**/.venv/**",
+        "**/venv/**",
+        "**/env/**",
+    ];
+    for pat in expected {
+        assert!(BUILTIN_BLACKLIST.contains(&pat), "missing pattern: {pat}");
+    }
+}