docs: per-package READMEs with full primitive catalog and registry notes backfill
- core/README.md: envelope contract, field table, PII discipline, quickstart
- BEHAVE-SHELL/README.md: all 76 primitives documented across 9 categories;
TLS/SSH/C2 fingerprint sections with [DRAFT — verify] markers on uncertain entries
- BEHAVE-TEXT/README.md: all 35 primitives across 6 categories; Rutify calibration
notes inline; content.* layer marked EXPERIMENTAL throughout
- primitives.py (SHELL): backfilled notes for all previously undocumented primitives
- primitives.py (TEXT): backfilled notes for capitalization_habit, emoji_*, length,
linebreak_style, sentence_complexity_class, question_formation_style,
imperative_style, response_latency_class, message_burst_rate
License: CC-BY-SA-4.0 (prose) / GPL-3.0-or-later (code)