godot: distill the Godot agent v0.1.0

[ryanlitalien]

Distills the godot agent v0.1.0 from the private working repo into a new public plugin, replacing the Planned placeholder. First new-plugin distillation run under DISTILLING.md.

What's in it

• 4 skills (godot-observe, godot-build, godot-test, godot-gdscript), agent def, 3 commands, PreToolUse guard hook, and the export-retry script, ported essentially intact as reference material.
• LEARNINGS.md compressed 82 to 55 lines (33%) and NOTES.md's validation sections 53 to 37 lines (30.2%) per DISTILLING (b), leaning on the skills shipping in full so the logs point rather than restate.
• Every "Verified against Godot 4.7.1, GDScript only" caveat and the explicit not-verified list (other engine versions, C#/Mono, Web export, Godot 3.x, .uid generalization) kept.
• Root README: godot row Planned to Ready (v0.1.0), Godot Foundation added to Trademarks. Marketplace entry added as a text edit, so the other plugin entries are untouched in the diff.

Sanitization notes

• plugin.json homepage/repository and the install block point at ButterStack/gamedev-agents.
• Sanitization grep over all added lines: zero hits. No em/en dashes or ellipsis characters.

Verification

• scripts/lint-plugins.sh passes, 0 warnings.
• bash -n clean on both scripts; guard live-tested: allows rm -rf .godot and scoped git clean -f -- '*.uid' '*.import', blocks unscoped git clean -f, rm project.godot, and .import sidecar deletion.

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