chore: pin rust toolchain to 1.96 for edition2024 deps (#2228)

- add ecc2/rust-toolchain.toml pinning stable 1.96 (deps now require
  edition2024, which needs rustc 1.85+; local 1.84 could no longer build)
- make git test fixtures hermetic: disable core.hooksPath inside temp
  repos so global identity-checking pre-push hooks cannot fail tests

ecc2/rust-toolchain.toml

@@ -0,0 +1,4 @@
+[toolchain]
+# Minimum 1.85 required: several dependencies use edition2024.
+channel = "1.96"
+components = ["rustfmt", "clippy"]

ecc2/src/session/manager.rs

@@ -5043,6 +5043,9 @@ mod tests {
         run_git(path, ["init", "-q"])?;
         run_git(path, ["config", "user.name", "ECC Tests"])?;
         run_git(path, ["config", "user.email", "ecc-tests@example.com"])?;
+        // Keep fixtures hermetic: a global core.hooksPath (e.g. identity-checking
+        // pre-push hooks) must not run inside test repos.
+        run_git(path, ["config", "core.hooksPath", "hooks-disabled"])?;
         fs::write(path.join("README.md"), "hello\n")?;
         run_git(path, ["add", "README.md"])?;
         run_git(path, ["commit", "-qm", "init"])?;

ecc2/src/tui/dashboard.rs

@@ -15047,6 +15047,9 @@ diff --git a/src/lib.rs b/src/lib.rs
         run_git(path, &["init", "-q"])?;
         run_git(path, &["config", "user.name", "ECC Tests"])?;
         run_git(path, &["config", "user.email", "ecc-tests@example.com"])?;
+        // Keep fixtures hermetic: a global core.hooksPath (e.g. identity-checking
+        // pre-push hooks) must not run inside test repos.
+        run_git(path, &["config", "core.hooksPath", "hooks-disabled"])?;
         fs::write(path.join("README.md"), "hello\n")?;
         run_git(path, &["add", "README.md"])?;
         run_git(path, &["commit", "-qm", "init"])?;