[leehack]

Dinja's built-in strftime_now reads wall time on every call, preventing reproducible date-dependent templates.

Export strftimeNow(DateTime) for a fixed clock supplied through a render's context. Default renders keep their own wall clock. Both paths share validation, formatting limits and escaping. Prepare version 1.3.2 for llamadart #859.

The helper preserves captured/macro-produced input provenance before caller-function registration; this fixes the escaping defect found during independent review without changing ordinary caller-defined functions.

Validation at 9d36ce25a38c22e200f9c205405dbbb6daba68d6 against 3881b4240cf48884d8eba8f25292bb43d7ec802a:

• Analysis/format and package publish dry run passed, with zero warnings.
• VM: 1212 passed, 11 skipped. Maintained Chrome lane: 1103 passed, 11 skipped.
• Fresh independent review: no blocking findings; original escaping repro plus 156 audit tests and full VM suite passed.
• Hosted CI passed: https://github.com/leehack/dinja/actions/runs/40217674420.
• No review threads. No package release published yet.