feat(templates): add threed_basic manual collision

[wh000wh000]

threed_basic v1.1

Upstream note: this is stacked on #47 because the upstream v1.0 base is still awaiting maintainer merge. Review the v1.1 delta as 3c0143b..3a0b59a.

Field	Evidence
Version	v1.1 manual static collision
Hypothesis	A pure XZ resolver plus declarative radii is enough to keep primitive-based games on authored roads and prevent obstacle tunnelling without adding physics
Problem source	v1.0 generated games had no shared road or obstacle collision authority
Root cause	The archetype exposed visual floor and obstacle data but no player radius, obstacle radius, or shared movement resolver
Modified module	Frozen archetype template and threed_basic builder manuals only
Not modified	2D Phaser templates, control plane, workspace, engine/store, MCP mounting, asset generation pipeline
Representative game	aurora-circuit-3d-v1-1, game 80300b3d322a0abd, one POST, done/ok
Build	packages/core PASS; core3d standalone PASS; representative game PASS
Tests	packages/core 150 files, 3163 passed, 2 skipped; collision self-check PASS
Smoke	WebGL context PASS; non-black canvas PASS; console/page/request errors 0; ESC pause/resume PASS
Playthrough	Real keyboard input collected 7/7 and reached TRAIL COMPLETE
2D regression	neon-flotilla Phaser smoke PASS
Protocol and MCP	protocol 6/6 consistent; MCP selftest PASS
Fork merge and fresh main	fork PR #2 merged as fb526de; fresh detached main repeated core build, 150/3163 tests, standalone core3d build/smoke, synthesized archetype build/self-check
Assets	Existing image-only pipeline; 3 generated images; displaySize declarations retained; no model or physics asset
Performance	Representative bundle 505.08 kB minified, 128.12 kB gzip; current linear collision scan is bounded to authored 8-16 objects
Risk	Full-circle containment requires overlapping floor patches wide enough for the player diameter; builder docs now state the contract
Rollback	Revert the two commits in this PR
ADR candidate	ADR-010 manual collision contract is recorded in the governance repository change package
Evidence	smoke shots: /tmp/aurora-v1-1-smoke.NZrnSD; victory: /tmp/aurora-v1-1-win.png; machine line: opengame-server/tests/e2e/report.jsonl g19a

Frozen-layer delta

File	Change
agent-test/templates/modules/threed_basic/src/CollisionResolver.ts	New pure substepped road and obstacle resolver
agent-test/templates/modules/threed_basic/src/GameScene.ts	Route all XZ movement through the resolver
agent-test/templates/modules/threed_basic/src/SceneMap.ts	Add player spawn and explicit obstacle radii
agent-test/templates/modules/threed_basic/src/gameConfig.json	Add consumed player collision radius and remove superseded clamps
agent-test/templates/modules/threed_basic/tests/collision-selfcheck.ts	Minimal edge, tunnelling, and slide check
agent-test/docs/modules/threed_basic/design_rules.md	Collision design boundary
agent-test/docs/modules/threed_basic/template_api.md	Resolver and SceneMap contract
agent-test/docs/modules/threed_basic/threed_basic.md	Builder execution and troubleshooting guidance

Production findings carried forward

Finding	Classification	Next version
Four generated config leaves have no runtime consumer	Template/protocol consistency	v1.2
v2-accept reports nested 3D asset-pack keys as missing although runtime consumes them	Acceptance parser	v1.3

No P0 or P1 remains in the v1.1 collision increment.

[wh000wh000]

Superseded by #57, which rebases the complete threed_basic v1 milestone onto current origin/main and excludes unrelated fork-only changes.