aetherbound-guild/docs/runtime/PHASE9_0R4_SECOND_CYCLE_ADAPTATION_CONTRACT.md

Phase 9.0R4 Second-Cycle Adaptation Runtime Contract

State Machine

first_battle
  -> first_result_diagnosis_and_coin
  -> adaptation_unselected
  -> adaptation_selected
  -> second_battle
  -> second_result

first_result_diagnosis_and_coin commits the existing Steady B0/R1/Q0 victory Coin exactly once. Viewing or leaving any page does not mutate Coin. The adaptation is reversible until Begin second battle; after that it is locked for the encounter.

First Result

The cause line is derived only from committed P9.0R3 facts:

• Hearthguard: first strike -18, explicitly blocked;
• Wayrunner: first strike -12, explicitly evaded/reduced;
• Farstring: one rear hit -36 opened the finish;
• Kindhand: one heal +12, capped by current front HP.

The player sees the cause before +20 Coin, current front HP and the next action. The result does not claim casualty, reward draft, Market or persistence.

Adaptation Choice

Stable ID	Player-facing promise	Tradeoff	Recommended when
EQ-002	Anchor the front against the veteran's first push; first hit becomes -10	The next front basic resolves after the rear action	No rear healer is present or survival is preferred
EQ-061	Resolve the first front basic before the veteran strikes	Full -30 strike lands and the second front basic is delayed	Kindhand can recover the hit or speed is preferred

Recommendation is explanatory, never selection. Both buttons remain equally reachable and the selected state can be changed before commit.

Second Battle Event Map

EQ-002 safer route

1. both lines enter;
2. veteran telegraphs a pushing strike;
3. Frontpin resists displacement and the front commits 100 -> 90 (-10);
4. Farstring commits enemy 100 -> 64 (-36) or Kindhand commits front 90 -> 100 (+10, exact capped heal);
5. delayed front/rear coordination commits enemy to 34;
6. finisher commits enemy 34 -> 0.

EQ-061 faster route

1. both lines enter;
2. Early Bell advances the first front basic and commits enemy 100 -> 72 (-28) before the strike;
3. the full pushing strike commits front 100 -> 70 (-30);
4. Farstring commits enemy 72 -> 36 (-36) or Kindhand commits front 70 -> 82 (+12);
5. the delayed second front basic commits enemy to 24;
6. finisher commits enemy to 0.

Every HP mutation emits one matching P9.0R3 feedback payload. Non-mutating telegraph/recovery states emit no number. Existing animations may be retimed or reordered but their source frames cannot change.

Presentation

• Result and preparation remain battlefield scenes, not receipt tables or nested cards.
• The two loan choices read as physical tactical plinths with a familiar shield and bell/tempo symbol, exact effect, cost 借用/Loan, and one tradeoff.
• The known threat and current two-person squad stay visible with the choice.
• Second result leads with 更稳/Safer or 更快/Faster, then shows exact front HP and elapsed time. It never says one route is globally best.
• 844x390 is the primary fast-preview viewport; content must not require scrolling. Portrait retains the rotate notice.

Preview Evidence

• Focused test covers once-only Coin, no preselection, selection revision, commit lock, both route event maps, exact HP, distinct elapsed time, Restart and Home cleanup.
• One normal-render 844x390 Simplified-Chinese route captures first result, unselected adaptation, selected adaptation, second battle and second result.
• Logs are scanned for script, parse/resource/import, assertion, ObjectDB and cleanup markers.
• The exported H5 is labeled preview. It is not immutable candidate evidence.