Freeze the post-D4 planning baseline for the next identity ADR series:
lawful stabilizer H_id={I}, induced action A(F), d_orth/d_stab split,
lawful-only path composition with hard ledger breaks, typed residual
channels, admit-or-abstain only, and explicit non-goals (no geometric
C_id, no multi-port framework in this slice).
Implementation starts only after D4 Phase 6 (or explicit waiver). Does
not expand or interrupt the live ADR-0244 D4 arc.
[Verification]: Smoke suite passed locally (314s, 176 passed)
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