docs(claude.md): align with spec v0.18

[ottovlotto]

Summary

Refresh the product context in CLAUDE.md from spec v0.12 → v0.18 so future Claude Code sessions in this repo work from current product truth.

Key content changes:

• Scoring overhaul (CR1 / CR6 / CR7): tutorial = 100 XP flat (via tutorial flag, not per-level), deploy = 0, moddable bonus = 0, your-app-is-modded = 50, star = 10. UI applies uniform 10× multiplier on displayed values.
• Stars are one-way, permanent, binary (CR2): drop the "binary vs max-2 pending" framing.
• Tutorial rename: "Rock Paper Scissors tutorial" / "the tutorial" — not "The Stadium" (per v0.18 vocabulary table).
• Display name precedence: registry username → wallet name from host → truncated H160. Drop the adjective-noun generator + Bulletin-stored-name + first-encounter ceremony framing — explicitly out of scope.
• Sample apps: Feedback Board built (Todor); The Ballot, Kudos, Countdown, Pact are candidates.
• Leaderboard is V1 (not deferred to V2 as v0.12 said).
• Prize logistics: ~$2k split four ways at $500 each (Top Builder / Most Modded App / Most Starred App / Wildcards).
• Drop per-feature build statuses from feature lists — they go stale fast; the spec is the place statuses live.

Removes stale "not yet built" annotations that have since landed:

• modded-from capture in dot mod
• parallelised dep install in dot init

Adds v0.18 backlog items that are now in scope:

• mobile signing hang detection
• up-front phone approval count on dot deploy
• dot mod post-clone UX (auto-cd or copyable cd <name>)

Adds dot decentralize (shipped under #211) — interactive command that takes a live static site URL and gives back a .dot URL hosted on Bulletin. Spec lists this concept as V2.5 dot import; the CLI ships it earlier under a different name.

Source spec: `~/Downloads/playground-dot-SPEC-v0.18.md` (27 May 2026).

Test plan

• CI license header check passes (no source files touched, docs only)
• Format check passes (markdown only)
• No `grep "The Stadium"` hits outside the vocabulary-table avoidance column
• No `grep "v0.12"` hits anywhere

[github-actions]

Dev build ready — try this branch:

curl -fsSL https://raw.githubusercontent.com/paritytech/playground-cli/main/install.sh | VERSION=dev/docs/claude-md-v0.18 bash

[github-actions]

E2E Test Pass · ✅ PASS

Tag: e2e-ci-pr · Branch: docs/claude-md-v0.18 · Commit: 248ac48 · Run logs

Cell	Result	Time
pr-preflight	✅ PASS	1m24s
pr-mod	✅ PASS	1m20s
pr-deploy-foundry	✅ PASS	0m38s
pr-init-session	✅ PASS	1m45s
pr-install	✅ PASS	0m39s
pr-deploy-cdm	✅ PASS	2m02s
pr-deploy-frontend	✅ PASS	3m30s
${{ matrix.cell }}	⏭️ SKIP	0m-1s
${{ matrix.cell }}	⏭️ SKIP	0m-1s

Sentry traces: view spans for this run