Implement structured, machine-readable logging per MASTER_SPEC §22, §25.7 in
compiler/common/log.py.
- DebugLevel IntEnum with the four levels (None/Basic/Verbose/Developer),
ordered; DebugLevel.from_config maps a debug config section to a threshold
(disabled -> None).
- LogRecord: immutable structured record (level, event, fields) with a
machine-readable to_json; no timestamps, so logging stays deterministic.
- StructuredLogger: filters by threshold, emits to an injectable sink, and
offers basic/verbose/developer helpers plus from_config. No global state.
- json_lines_sink writes one JSON object per line to a stream (never print).
- Tighten configuration.schema.json debug.level to enum
none/basic/verbose/developer.
Tests: level filtering across all four levels, structured/immutable records,
config integration, and a guard asserting no print() exists in the compiler
package.
Co-authored-by: kunail0804 <kunail0804@gmail.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
