serp-log

A logging drop-in for the Serpentine subset. The process-global logger registry and configuration live in the runtime (serp_log_core, a str→str KV store + stderr sink — DECISIONS.md D12), so getLogger("a.b") behaves like CPython's singleton registry even though Logger values are plain immutable dataclasses.

Mirrored surface (19/19 stdlib parity checks)

• getLogger(name="") with dotted-name effective-level inheritance; setLevel / getEffectiveLevel / isEnabledFor / level.
• debug/info/warning/error/critical/log on loggers and at module level (module-level calls run basicConfig() implicitly, like CPython).
• basicConfig(level=, format=, filename=, filemode=) with CPython's configure-once semantics; file output is byte-identical to stdlib.
• The last-resort handler: unconfigured records ≥ WARNING print the bare message to stderr.
• getLevelName incl. the "Level N" form; constants CRITICAL/FATAL/ERROR/WARNING/WARN/INFO/DEBUG/NOTSET.

Caps

Messages are single pre-formatted strings (use f-strings — no %-args); format supports %(levelname)s/%(name)s/%(message)s; no Handler/Formatter/Filter objects; no exception()/exc_info; no addLevelName/disable. Legacy helpers (make_logger, log_line, level_name, append_log) are retained.

Install into a Serpentine project with serp add serp-log.