Compose same-plan Harass and Reinforcements with original reserve costs

docs/REINFORCEMENTS_RUNTIME.md

@@ -9,8 +9,9 @@ families; Basic/unprofiled co-side use stays guarded. The
 holder may commit it in either Battle Plan card slot. It is neither a weapon
 nor a defense: Prescience of a category receives **None**, while the physical
 slot stays occupied and hidden until reveal. A named-card inspection still
-fixes the exact card. Harass & Withdraw and Stone Burner cannot share this
-plan; Homeworld and other optional-module combinations remain gated.
+fixes the exact card. Harass & Withdraw may share the plan under the
+[provisional original-cost-first policy](#combined-utility-plan--16-october-2026).
+Stone Burner, Homeworld and other optional-module combinations remain gated.
 
 The [combined-army follow-up](ECAZ_OCCUPY_RULES.md#independent-cards-with-combined-armies--2-october-2026)
 retains own-holder reserve cost and selected lead card/payment ownership.
@@ -23,3 +24,53 @@ The holder must have three own reserve counters when sealing the plan. The owner
 The owner receives a card-slot explanation and disabled reason when fewer than three reserve counters remain or the bounded mode is unsupported. All four AI profiles generate legal candidates in the classic and Ecaz/Moritani profiles and can select either slot, including an Advanced plan. The current scoring is a minimal legal participation heuristic, not difficulty calibration. The prototype does not certify the whole three-card variant, other expansion combinations, optional modules, historical-save compatibility or public mode starts.
 
 Focused rule, engine, controls and in-memory SQLite tests cover both slots, Basic/Advanced payment, elite subpool conservation, traitor/explosion disposal, private sealed views, JSON restoration, rejected-action immutability and competing final room commits, now including a paired Ecaz/Moritani saved battle. The test results and actual browser/UI evidence for the current checkpoint are recorded in [Implementation status](IMPLEMENTATION_STATUS.md); test coverage is not a publisher ruling.
+
+## Combined utility plan — 16 October 2026
+
+The standing choose-recommended priority selects the existing native settlement
+order for the two physical specials in one plan: quote and debit three
+**original own reserve** counters before Harass returns any undialed counters.
+This is an implementation interpretation, not a newly retrieved publisher FAQ
+or an answer to the earlier reserve-payment question. The source audit's printed
+effects and original provisional all-outcome/normal-first cost are unchanged.
+
+Three reserves must exist at commitment. A future return cannot fund a deficient
+plan or change its quoted normal/elite mix. For example, two original ordinary
+and one elite reserve are spent even when Harass subsequently returns four
+ordinary counters. Both cards discard once. The +2 remains normal-score-only,
+not extra physical dial, support or winner casualties. Opposing successful
+Traitor cancels only Harass; Reinforcements still pays under its existing
+provisional all-outcome policy.
+
+Both slot orders compose in the existing Basic/Advanced and selected Advanced
+Occupy envelopes. Only the card user's reserves and undialed forces change;
+original fixed Ecaz commitment and the other ally's pool stay separate.
+Stone/Reinforcements, Basic/unprofiled co-side and other module gates stay.
+No persisted state or fresh/public profile is added.
+
+### Scoped proof
+
+The affected eleven-file offline union passes **134/134**, with types/lint and
+production build passing (module-register, large-chunk and Unknown-route
+warnings). Six new behavioral regressions cover both slots, original typed
+costs, deficient original reserves, all Traitor outcomes, explosion and both
+active Occupy card-user roles. The test battle uses rock so automatic
+collection income cannot obscure support accounting.
+
+Fresh Node programs exercise eight Basic/Advanced cases across all four
+profiles, both slot orders and16 accepted continuation actions. A real styled
+390px journey starts at three reserves (two normal, one elite), selects both
+cards and shows the explicit provisional order. Original dial1/support1 with
+leader2 plus bonus2 beats opposing leader4. Four ordinary fighters return;
+the original elite reserve is spent, leaving reserves4/Tanks16/elite Tanks5,
+spice29 and no army, battle or decision. Both cards discard once; native
+collection opens. No root overflow or browser/application error occurred.
+
+Current guide parse, combined-policy anchor and38 evidence paths across the
+two topics resolve; all ten checklist facets remain Partial. Removed the
+obsolete pair rejection and an incidental absent-card candidate pin. No
+human server, saved room, D1, deployment or public gate changed; no new broad,
+HTTP, recovery/privacy/custody assurance campaign ran. Private proof artifacts
+remain outside Git; the owned source host and throwaway scripts were removed.
+
+