feat: build p9.1 opening market runtime

Implement the bounded Godot opening Company and first-Market preparation flow with deterministic one-shot state, real touch verification, responsive layouts, prototype feedback, and current design regressions.\n\nCo-Authored-By: Codex <noreply@anthropic.com>

docs/runtime/PHASE9_GODOT_VERTICAL_SLICE_CONTRACT.md

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+# Phase 9 Godot Vertical Slice Contract
+
+## Runtime Envelope
+
+- Engine: Godot `4.6.1.stable`.
+- Project root: `runtime/`.
+- Orientation: landscape, reference viewport `1280x720`, stretch `canvas_items`.
+- Input: touch-first; mouse is a desktop convenience and not mobile evidence.
+- Languages: Simplified Chinese default and English.
+- Rendering: `gl_compatibility`, mobile-safe 2D only for P9.1.
+- Offline: no account, analytics, network or purchase dependency.
+
+## P9.1 State Machine
+
+```text
+contract -> offers -> opening_review -> opening_receipt
+  -> market_hire_mael -> market_hire_ilya -> equipment_purchase
+  -> equipment_equip -> order -> readiness_receipt
+```
+
+Legal reverse paths before commits are offers-to-contract, opening-review-to-
+offers, and order revision. Opening, each hire, purchase, equip and readiness
+commit are one-shot. Repeated input returns the current state and cannot
+duplicate Recruit, Coin, equipment or receipt mutations.
+
+## Fixed Runtime Data
+
+- Contract: `CTR-R1-01 First Crossing`.
+- Opening Coin: `52`; Company capacity: `4`.
+- Stable offers: `OFF-01` Elian/Hearthguard, `OFF-02` Nia/Farstring, `OFF-03`
+  Tomas/Wayrunner, `OFF-04` Sable/Kindhand.
+- Market offers: `MKT-R1-01` Mael/Hearthguard and `MKT-R1-02` Ilya/Farstring,
+  each `14 Coin`.
+- Equipment: `EQ-012 Open-Line Cord`, `12 Coin`, explicitly equipped to one
+  current Company member; fixed evidence equips `OFF-03` Tomas.
+- Final readiness: Coin `12`, Company `4/4`; exposed-front direction remains
+  on the right and protected rear on the left in both locales.
+
+## Presentation Contract
+
+The opening frame reads in three seconds as a traveling fantasy Company about
+to cross a dangerous suspended route. Priority is (1) current decision and
+primary action, (2) Company/Recruits, (3) Coin/capacity/receipt state. Existing
+accepted candidate scene, actor and equipment assets are reused; they remain
+candidate production assets, not final art.
+
+Selection must change card border, check mark and count. A transaction must
+show the old and new resource values, a short visual pulse and a captioned
+prototype sound cue. Disabled actions are visibly disabled and state why.
+Reduced motion removes movement but preserves state change. Mute changes no
+result. No tutorial wall, decorative nested cards or battle content is legal.
+
+## Test Contract
+
+- `ABG_P9_1_DOMAIN_OK`: state transitions, invalid boundaries, stable IDs,
+  one-shot transactions and exact final values.
+- `ABG_P9_1_TOUCH_OK`: fresh runtime driven by parsed ScreenTouch events reaches
+  the readiness receipt with fallback/direct count zero.
+- `ABG_P9_1_LAYOUT_OK`: all declared viewport/language/accessibility fixtures
+  remain within safe bounds.
+- `ABG_P9_1_RUNTIME_CAPTURE_OK`: normal-render screenshots cover six required
+  states and strict runtime diagnostics are clean.
+
+Tests and tools may not implement product behavior or relax product guards.