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/README.md

@@ -0,0 +1,54 @@
+# Runner Examples
+
+This directory contains organized examples demonstrating different aspects of the runner system.
+
+## Directory Structure
+
+```
+examples/
+├── osiris/          # OSIRIS context and object management examples
+├── sal/             # System Abstraction Layer (SAL) DSL examples
+└── utils/           # Utility examples (signing, crypto, etc.)
+```
+
+## Running Examples
+
+### OSIRIS Example
+Complete example demonstrating OSIRIS context management, Note and Event creation, and access control:
+
+```bash
+cargo run --example osiris
+```
+
+See [osiris/README.md](osiris/README.md) for details.
+
+### SAL Example
+Examples demonstrating various SAL DSL modules for system operations:
+
+```bash
+cargo run --example sal
+```
+
+See [sal/README.md](sal/README.md) for details.
+
+### Utility Examples
+Utility examples for cryptographic operations and job signing:
+
+```bash
+cargo run --example sign_job --features crypto
+```
+
+See [utils/README.md](utils/README.md) for details.
+
+## Prerequisites
+
+- Redis server running on `localhost:6379`
+- For OSIRIS examples: HeroDB instance (or uses local SQLite)
+- For crypto examples: Enable the `crypto` feature flag
+
+## Example Structure
+
+Each example folder contains:
+- `main.rs` - The main Rust example code
+- `*.rhai` - Rhai script files demonstrating various features
+- `README.md` - Detailed documentation for that example category