feat(kernel): R7a C/C++ walker — dual-lang ccpp module, preParse hoist, 7 new blanks, c/cpp default-routed (#1346)

Parity: 0 diffs on redis/git/fmt/protobuf/ALS sweeps; full-init dumps
byte-identical on all five + linux at kernel scale (10.4M dump lines,
same sha256 both arms). Linux 2c/6GB envelope: kernel-arm 19.1min vs
wasm-arm 22.9min (parse 356s vs 435s) on a much richer graph (the new
blanks recover error-swallowed code: git 2x nodes, linux kernel/+mm/ 3x).
Deferral guard corrected by measurement (C/C++ error incidence 9-42%;
--max-deferral flag); defer-reuse memo kills the 3x re-blank/re-parse
cost deferred files paid.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

codegraph-kernel/Cargo.toml

@@ -25,6 +25,11 @@ tree-sitter-javascript = "0.25"
 tree-sitter-java = "0.23"
 tree-sitter-python = "0.23"
 tree-sitter-go = "0.23"
+# Pinned exact: the vendored wasm (src/extraction/wasm/) was built from these
+# tags' checked-in parser.c, sha-matched against these registry tarballs
+# (R7a prep, #1345). A patch bump here without re-vendoring breaks the match.
+tree-sitter-c = "=0.24.2"
+tree-sitter-cpp = "=0.23.4"
 
 [build-dependencies]
 napi-build = "2"