v0.0.1

Added

• Standard schema building blocks. Parameterized mixins — audit
  (created/updated timestamps + actor attribution), audit_log (field-level
  change history), timestamps (actor-free created/updated), and soft_delete
  — plus the audit_stamp / audit_diff / audit_skip_noop /
  timestamps_stamp trigger functions and the append-only audit_log table.
  Each app supplies its own identity table and actor GUC via schema-flow
  imports params (user_table / user_pk / actor_guc, defaulting to
  users / user_id / app.actor_id), so the package depends on no app's
  data model.
• Bootstrap back-fill helper. audit_backfill_by(p_actor) fills NULL
  created_by / updated_by left by actor-less seeds (so the post-seed
  NOT NULL tighten passes), attributing them to a fallback identity the app
  supplies. Call it from a post/ script — or avoid it entirely by pre-setting
  a sentinel actor for the bootstrap.
• End-to-end test suite. Applies the real shipped schema through
  schema-flow imports + params against a throwaway Postgres (docker
  compose), asserting both structure and audit/timestamp/soft-delete behavior.