Expand _MEMORY_THREAT_PATTERNS from 13 to 24 regex patterns and align
_INVISIBLE_CHARS with skills_guard.py (10 → 17 characters).
Key changes:
- Add multi-word bypass prevention (?:\w+\s+)* to injection patterns
- Add missing injection patterns: role_pretend, leak_system_prompt,
remove_filters, fake_update, translate_execute, html_comment_injection,
hidden_div
- Add exfiltration patterns: send_to_url, context_exfil
- Add persistence patterns: agent_config_mod, hermes_config_mod
(both require modification-verb prefix to avoid false positives on
mere mentions of config filenames)
- Add hardcoded secret detection pattern
- Add role_hijack precision fix: require article after "now" to avoid
blocking "you are now ready/connected/set up" etc.
- Expand invisible unicode set with directional isolates (U+2066-2069)
and invisible math operators (U+2062-2064)
Test coverage expanded from ~8 to ~30 scan tests including dedicated
false-positive regression tests for all precision-sensitive patterns.
Known limitations (deferred to follow-up PRs):
- prompt_builder.py and cronjob_tools.py still use older pattern sets
- No semantic/LLM-based scanning (regex-only approach)
- No cross-entry or cross-store analysis
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