anti c9a81a23c2 feat(profiler/behave_shell): asciinema parser + paste-burst detection ...

BEHAVE-EXTRACTOR.md Phase A Step 1. Lays the shared primitives that
Steps 2-3 (motor.input_modality, motor.paste_burst_rate) will
consume:

* parse_shard_line / parse_shard turn a shard JSONL line/file into
  AsciinemaEvents, skipping headers and malformed records.
* PasteBurst dataclass + _detect_paste_bursts group consecutive
  paste-class input events (len(d) >= 4 chars per the prototype's
  empirical floor) into contiguous bursts, splitting on IAT gaps
  larger than PASTE_BURST_MAX_IAT_S (200ms).
* SessionContext now carries iats and paste_bursts derivations.
* Threshold constants harvested from
  BEHAVE/prototype_extractors/shell/extract.py — calibrated against
  the five 2026-05-02 shards.

Tests cover pure-typed, pure-pasted, mixed streams; close vs far
paste events; typed events breaking a burst; PasteBurst immutability;
and the JSON parser's junk handling.

2026-05-03 07:46:01 -04:00

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