engine: standard-library logging for diagnostics#31
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Add a 'harel' logger (NullHandler attached, silent by default). Emit debug at event dispatch/transition, spawn, publish, and timer fire; warning at dead-letter and when an instance faults. Diagnostics never touch stdout (reserved for CLI results). Tests via caplog; README documents enabling it. Closes #29.
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Closes #29.
Adds operational diagnostics via stdlib
logging(distinct from the Observer, which is domain observability).What
harellogger with aNullHandlerattached in__init__— silent by default; the host app opts in (logging.basicConfig(level=logging.DEBUG)).DEBUG), spawn, publish, timer fire (DEBUG); dead-letter and fault transitions (WARNING). Per-module loggers (harel.engine,harel.instance).Verify
4
caplogtests (dispatch/transition at DEBUG, fault at WARNING, level gating, NullHandler present) + a smoke check that records emit once logging is enabled. Full gate: ruff + mypy clean; 173 tests (was 169). README documents it.