feat: M3.7.7 signature extraction CLI + integration tests (unit tests pass, integration tests pending mem-cli fix)

fixtures/failures/npm-run-a.txt

@@ -0,0 +1,23 @@
+> [email protected] build
+> cargo build --release
+
+Compiling mem-cli v0.1.0 (/home/runner/work/Poimen/memory/crates/mem-cli)
+error: unresolved import `mem_core`
+ --> crates/mem-cli/src/main.rs:15:5
+  |
+15 | use mem_core::{Record, Provenance, Role};
+   |     ^^^^^^^^ could not find `mem_core` in `extern prelude`
+   |
+   = note: consider adding `extern crate mem_core` to use the crate
+
+error: could not compile `mem-cli` due to previous error
+
+npm ERR! code ELIFECYCLE
+npm ERR! errno 1
+npm ERR! [email protected] build: `cargo build --release`
+npm ERR! Exit status 1
+npm ERR! 
+npm ERR! Failed at the [email protected] build stage.
+npm ERR! Make sure you have the latest version of node.js and npm installed.
+
+npm WARN optional optional dependency failed, continuing [email protected]