v0.12.0

- digest: per-project rollup of recent sessions (files touched + synopses)
- security: resume validates the session-derived working directory before
  launching; untrusted reads are size/row capped; SECURITY.md corrected
- README: simplified, comparison table, banner/badges refreshed for 9 tools

History note: all git history and tags were rewritten to remove personal
identifiers that had leaked into earlier commits; this is the clean baseline.