anti f3880b24d1 feat(profiler/behave_shell): command segmentation in SessionContext ...

BEHAVE-EXTRACTOR.md Phase A Step 4. Pure refactor inside _ctx.py —
no new feature emits. Lays the shared utility for the three
cognitive primitives next in line (Steps 5-7).

* Command dataclass (frozen): start_ts, end_ts, first_token_hash.
  PII-safe by construction — only the first whitespace-delimited
  token of the command is retained, and only as a sha256 hash
  (decnet/profiler/behave_shell/_parse.py:hash_token).
* _segment_commands walks input events char-by-char, splits on
  \r / \n, hashes the first token, drops the rest.
* SessionContext gains commands, inter_cmd_iats, output_per_cmd.
  output_per_cmd[i] counts bytes between commands[i].end_ts and
  commands[i+1].start_ts — the natural pairing for Step 7
  (feedback_loop_engagement).

Tests: empty / unterminated streams, single command (CR + LF
terminators), paste-with-newline, multi-command IAT pairing,
output-byte counting between boundaries, blank-line skip,
first-token-only PII discipline.

2026-05-03 07:50:55 -04:00

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