v1.4.0

Added

• references/prompt-authoring.md:
  • where the template engine (gonja v2.9.0) differs from Python Jinja, as a
    table of traps that fail silently, probed on the production version
  • how to parse {{now}} safely (its current shape, the non-breaking-space
    history, a validity check with a fallback), and a preference for {{hour}}
    and the other dedicated variables
  • computing derived values onto customerContext so the body stays
    cacheable
  • the 1024-character limit on ai_instruction_identity
  • silence after a successful transfer
  • "Scripted lines are copied, so scope them" and "How scripted to make it"
    (controlled variety as the default, with the measured cost of going fully
    free-form)
  • "Testing a change": re-test beyond the edited state, treat greeting edits
    as affecting every call, repeat a scenario before concluding, and a go-live
    checklist of guardrail and complaint cases
• references/tools.md: what resolve_date understands and returns, checked
  against the platform source: the phrase coverage, thai_readback, the two
  meanings of needs_confirmation, past dates, weekend-only is_business_day,
  and how to order the instruction.