feat: reorganize examples and add signature support to JobBuilder

- Reorganized examples into osiris/, sal/, and utils/ folders
- Moved hardcoded scripts to separate .rhai files
- Added signature() method to JobBuilder for job signing
- Updated OSIRIS context to use block_in_place instead of runtime
- Removed runtime field from OsirisContext
- Added typed save() methods for Note and Event objects
- Updated all examples to use new structure and APIs

examples/sal/scripts/git/git_basic.rhai

@@ -0,0 +1,28 @@
+// Simplified Git Basic Operations Example
+
+let git_tree = git_tree_new("/tmp/git"); // Using /tmp/git as base path
+
+print("--- Git Basic Operations ---");
+// print(`Base path: ${git_tree.base_path()}`); // base_path() getter would need to be exposed from Rust
+
+let all_repos = git_tree.list();
+print(`Listed ${all_repos.len()} repos.`);
+
+// Find repos starting with "home" (adjust pattern if /tmp/git might contain other "home*" repos)
+let found_repos = git_tree.find("home*"); 
+print(`Found ${found_repos.len()} repos matching "home*".`);
+for r in found_repos {
+    print(` - Found: ${r.path()}`);
+}
+
+print("Getting/Cloning 'https://github.com/freeflowuniverse/home'...");
+let repo = git_tree.get("https://github.com/freeflowuniverse/home");
+print(`Repo path: ${repo.path()}`);
+print(`Has changes: ${repo.has_changes()}`);
+
+print("Performing pull & reset...");
+repo.pull().reset();
+print("Pull and reset complete.");
+print(`Has changes after pull/reset: ${repo.has_changes()}`);
+
+print("--- Example Finished ---");