fix(core): update tests and examples to match Core API signature

[StarbirdTech]

Note: This was identified by Claude Code during work on #2988 — I haven't personally reviewed these changes yet. The fixes are mechanical (type signature updates) but flagging for maintainer review.

Core::new() and Core::shutdown() were updated to return Box<dyn Error + Send + Sync>, but several tests and examples still use Box<dyn Error>, preventing cargo test -p sd-core from compiling.

Changes

• Update return types in 5 test/example files from Box<dyn Error> to Box<dyn Error + Send + Sync>
• Fix stale schema in library_demo.rs — entry.device_id was removed (now volume_id), location needs volume_id field
• Remove unused uuid::Uuid import in job_registration_test.rs

Files changed

• core/tests/phase_snapshot_test.rs
• core/tests/event_system_test.rs
• core/tests/job_registration_test.rs
• core/examples/library_demo.rs
• core/examples/shutdown_demo.rs
• core/examples/indexing_demo.rs
• core/examples/job_logging_test.rs

Test plan

• cargo check --tests --examples -p sd-core compiles
• cargo test -p sd-core passes

🤖 Generated with Claude Code