feat(workflows): audit-warranted pre-step + priority and tag enforcement

Two changes land together because each is broken without the other.

open-tasks.org gains a new Phase A.1, evaluated only in Next Mode. The
phase reads :LAST_AUDIT: from notes.org and walks five state signals
(reminder/task mismatch, passed scheduled date, "waiting on X" matches a
shipped X, dead file: link, sub-task >75% DONE coverage). If the temporal
threshold of 14 days trips, or any signal fires, Next Mode offers a
task-audit run before producing the recommendation. Item 1 in the offer
is "run task-audit first" per the recommendation-at-item-1 convention.

task-audit.org gains two pieces. Phase C now enforces priority and
type-tag presence per the project's legend, applies the [#A] dating rule
from that legend, and re-assesses :quick: and :solo: from reconciled
facts. Unambiguous calls land autonomously. Ambiguous ones flag
NEEDS-USER instead of being guessed. A new Phase E stamps :LAST_AUDIT:
on completion.

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