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

Cargo.lock

@@ -2371,7 +2371,6 @@ dependencies = [
 [[package]]
 name = "osiris"
 version = "0.1.0"
-source = "git+https://git.ourworld.tf/herocode/osiris.git#097360ad12d2ea73ac4d38552889d97702d9a889"
 dependencies = [
  "anyhow",
  "clap",
@@ -2392,7 +2391,6 @@ dependencies = [
 [[package]]
 name = "osiris_derive"
 version = "0.1.0"
-source = "git+https://git.ourworld.tf/herocode/osiris.git#097360ad12d2ea73ac4d38552889d97702d9a889"
 dependencies = [
  "proc-macro2",
  "quote",