Loki Mode

Fixed

• Non-git codebase signature was blind to same-size content edits (path+size
  pairs only), so a stale generated PRD could be silently reused with a false
  "codebase unchanged" disclosure. The files: signature now also streams file
  content through the hash (clone-stable, batched via xargs so cost scales
  with bytes, measured ~0.2s per 10k files). Trees over
  LOKI_PRD_SIG_CONTENT_BUDGET bytes (default 50MB, documented in
  wiki/Environment-Variables.md) fall back to the previous fast listing
  (files-shallow:), where the limitation is documented honestly.
• The one-time signature-format upgrade is invisible and honest: a stored
  old-format signature whose listing fields match decides reuse (no false
  "Codebase changed" disclosure, no spurious update cycle) and the persisted
  date is preserved. Corrupted or truncated stored signatures still fall to
  update, as before.
• Empty-tree signature no longer embeds a double-zero count.
• Git projects are unaffected (git status already detects all edits).