chore: scaffold Godot 4.7.1 project — greybox falsifier phase

Design canon: advisors/game-design/concept/mechatronics/ (CONCEPT.md,
MOE.md). v1 target = the greybox falsifier per ROADMAP.md.

.gitignore

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+# Godot 4
+.godot/
+*.translation
+
+# OS noise
+.DS_Store

CLAUDE.md

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+# CLAUDE.md — U R M03
+
+Godot 4 game project. Science-fiction rogue-lite: strategy-forward
+mech auto-battler with a light action layer and a nurturing
+base-builder meta.
+
+## Design canon (read before designing anything)
+
+The design documents are canonical and live in the advisor repo,
+NOT here:
+
+| Document | Canonical for |
+|---|---|
+| `~/development/advisors/game-design/concept/mechatronics/CONCEPT.md` | All systems: loop stack, run skeleton, tag grammar, chemistry table, encounter grammar, base, economy, campaign |
+| `~/development/advisors/game-design/concept/mechatronics/MOE.md` | M03 ("Moe") — character bible, design law, scenes |
+
+Where they conflict: MOE.md wins for Moe, CONCEPT.md for systems.
+Design decisions are made in those documents first, then implemented
+here. Do not fork design decisions in this repo; propose changes
+against the advisor repo's docs.
+
+Non-negotiable canon highlights (full rationale in CONCEPT.md):
+
+- **ONE BOT** — the cast is M03, Khoe, and rescued humans. No other
+  friendly mech, ever. Build variety rides in RIGS.
+- **No immunities, no healing enemies, ever** (the invincibility
+  laws). Susceptibilities only; damage dealt is progress banked.
+- **Two-solutions rule** — every encounter answerable by brute force
+  AND by the read; cleverness pays only in speed, safety, spectacle.
+- **Combos produce verbs, not multipliers.** Every chemistry row is
+  a visible event, learnable by seeing it once.
+- **No tutorial, ever.** The base's growth order is the curriculum.
+- **Siege/base-defense mode: permanently rejected.** Do not build,
+  do not re-propose.
+
+## Engine
+
+- **Godot 4.7.1-stable, pinned.** Both dev machines run
+  `4.7.1.stable.official.a13da4feb` (Mac editor: `/Applications/
+  Godot.app` + `godot` shim; nh3-dev headless: `~/bin/godot`).
+  Do not upgrade unilaterally — version skew rewrites scene files.
+  An upgrade is an operator decision applied to both machines at
+  once.
+- Headless verification: `godot --headless` works on nh3-dev for
+  scripts, tests, and imports.
+- GDScript for design iteration; C# reserved for hot paths (none
+  yet).
+- 2D, pixel-first: integer scaling, nearest-neighbor filtering
+  (set in project.godot). Hi-bit mixed-res effects layer comes
+  later — greybox is deliberately art-free.
+
+## Current phase: GREYBOX (v1 per ROADMAP.md)
+
+The falsifier slice, specced in CONCEPT.md § Encounter grammar:
+one arena · one auto-fire KINETIC weapon · two cards (HEAT +
+KINETIC) · the KINETIC+HEAT chemistry row (knock a heated enemy
+into others → heat spreads on impact) · two enemy types (untagged
+grunt swarm + self-heating burster). It exists to falsify three
+bets: positioning ↔ build interaction, card-freeze rhythm,
+chemistry delight. Greybox art: primitives and placeholder shapes
+only — no sprites, no polish.

README.md

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+# U R M03
+
+Science-fiction rogue-lite: a strategy-forward mech auto-battler
+with a light action layer and a nurturing base-builder meta. You
+restore the last of the gentle giants; he goes out so nobody else
+has to.
+
+Godot 4.7.1 (pinned). Design canon lives in the game-design advisor
+repo (`concept/mechatronics/`); this repo is the implementation.
+Current phase: greybox falsifier — see ROADMAP.md.

ROADMAP.md

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+# ROADMAP — U R M03
+
+## v1 target — the greybox falsifier
+
+v1.0 of this repo is NOT the game; it is the playable slice that
+falsifies (or confirms) the design's three core bets. Cut v1 when
+all of these are true:
+
+1. **Arena + piloting** — one greybox arena; positioning-only mech
+   control (no aim, no combos).
+2. **Auto-fire build layer** — one KINETIC weapon that fires itself;
+   the build expresses itself visibly without input.
+3. **Card layer** — 2-slot hand, card-time dilation (freeze/dilate
+   toggle exposed as a knob), two cards: one HEAT, one KINETIC;
+   charges generated by the build.
+4. **Chemistry row** — KINETIC+HEAT: knocking a heated enemy into
+   others spreads heat on impact. Authorship-loud feedback stack
+   (hitstop + hues meeting + sting placeholder).
+5. **Two enemy types** — untagged grunt swarm + self-heating burster
+   (tests the literal enemy tag mirror).
+6. **Falsification playtest** — operator has played it and rendered
+   verdicts on the three bets: positioning ↔ build interaction,
+   card-freeze rhythm, chemistry delight.
+
+## Parking lot (post-greybox)
+
+Everything else, including: remaining 9 chemistry rows + 5 surges;
+node map / run structure; belt + full hand; keystones; base layer;
+salvage economy; drives/transits; zones; bosses; art pass (sprite
+grid test 32–48px); audio; naming pass (tags, modules, rigs);
+enemy factions as tag dialects; tuning knobs (CONCEPT.md § Open
+questions #2). None of it enters this repo until the greybox
+verdict is in.

project.godot

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+
+config_version=5
+
+[application]
+
+config/name="U R M03"
+config/features=PackedStringArray("4.7")
+
+[display]
+
+window/stretch/mode="viewport"
+window/stretch/scale_mode="integer"
+
+[rendering]
+
+textures/canvas_textures/default_texture_filter=0