diff --git a/.claude/shared b/.claude/shared
index fb49dae48b..763fb4c986 160000
--- a/.claude/shared
+++ b/.claude/shared
@@ -1 +1 @@
-Subproject commit fb49dae48b8c2b756fbe9f0f2f7f5ca01e72febd
+Subproject commit 763fb4c9865a0625716de8cde80d4af1b5edcef7
diff --git a/quest/m1/README.md b/quest/m1/README.md
index b97087b518..a58dc8767e 100644
--- a/quest/m1/README.md
+++ b/quest/m1/README.md
@@ -143,6 +143,7 @@ transport, benchmark tooling); worktrees isolate commits, not semantics.
 - [Kotlin JVM exit](/quest/m1/kt-jvm-exit.md) - a Kotlin/JVM program exits cleanly whatever the moq-ffi runtime thread is doing, like Python does since #3766
 - [Dart publish](/quest/m1/dart-publish.md) - the packages are built and dry-run clean but exist nowhere consumers can install from
 - [Dart codec parity](/quest/m1/dart-codecs.md) - Dart is the one binding that cannot originate media
+- [libmoq CMake library](/quest/m1/libmoq-cmake-lib.md) - the in-tree CMake build links the `libmoq.a` cargo reports, not a hardcoded `target/<profile>` path
 - [libmoq fetch](/quest/m1/libmoq-fetch.md) - libmoq gains an additive cached-group fetch entry point
 - [moq-mux on wasm32](/quest/m1/mux-wasm-target.md) - the crate's two wasm blockers are fixed and the target stays in the clippy lane
 - [#2850](/quest/m1/2850-js-net-give-reader-a-synchronous-decode-so-the-publisher.md) - js/net: decode messages synchronously from buffered bytes and delete the publisher read-ahead queue
diff --git a/quest/m1/libmoq-cmake-lib.md b/quest/m1/libmoq-cmake-lib.md
new file mode 100644
index 0000000000..ba5caa3103
--- /dev/null
+++ b/quest/m1/libmoq-cmake-lib.md
@@ -0,0 +1,27 @@
+# [XS] libmoq CMake finds the library cargo built
+
+## Goal
+
+`rs/libmoq/CMakeLists.txt` links the static library cargo actually produced,
+whatever `CARGO_TARGET_DIR`, `--target` triple, or profile the build uses.
+Today `BUILD_RUST_LIB` assumes `target/<debug|release>/libmoq.a`, so any other
+layout links a stale library or fails to find one.
+
+## Plan
+
+- `cmake/cargo-build.cmake` already parses cargo's JSON messages to find
+  `moq.h` in its hashed `OUT_DIR`. Read the libmoq `compiler-artifact`
+  message's staticlib filename from the same output and copy it beside the
+  header in the CMake binary dir, `ONLY_IF_DIFFERENT`. `RUST_LIB` then points
+  there. Chosen over forcing `--target-dir` into the build dir, which loses
+  the shared workspace cache, and over `cargo metadata`, which still guesses
+  the triple and profile subdirectories.
+- The `BUILD_RUST_LIB=OFF` prebuilt path is unchanged.
+- Regression test in CI: the existing `cpp/obs` build against `MOQ_LOCAL`
+  runs with `CARGO_TARGET_DIR` outside `target/`, so a hardcoded path fails
+  the build. Update `rs/libmoq/README.md` and `doc/lib/c` if they describe
+  the path.
+
+## Related
+
+- [libmoq shutdown](/quest/m1/libmoq-shutdown.md) - the other libmoq packaging fix OBS needs