Logging — verification

Test cases verifying the workspace-wide logging facade and its default DLT backend (see Logging — DLT base library with swappable backends). Each test directive :verifies: one req parent from Single facade for all takto... (REQ_0800) .. Bounded in-memory ring buff... (REQ_0814) and cites the path and line range of the covering Rust test under crates/taktora-log/tests/ or crates/taktora-log-dlt/tests/. Mirrors the structure of Bounded global allocator — verification for diff-friendly review.

The three remaining approved requirements in the chapter (ERROR and FATAL emission sh... (REQ_0813), Drop-oldest overflow policy... (REQ_0815), Console fallback installed ... (REQ_0816)) are deliberately not promoted here — each one has an open spec-vs-implementation drift flagged by the audit and needs a regenerate pass before its test can land at status=implemented.

The test cases are grouped by area (see the toctree): the facade and backend-swap surface, the DLT backend, runtime log-level control, and the non-blocking hot path with offline buffering.