chore: upgrade bulletin-deploy to 0.7.12

[EnderOfWorlds007]

Summary

• Bumps bulletin-deploy from 0.7.10 to 0.7.12
• Updates packageExtensions key in package.json to match new version
• Updates pin note in CLAUDE.md

Closes #146

Test plan

• TypeScript type check passes (tsc --noEmit)
• Unit tests pass (489/489)
• Smoke E2E suite passes (34/34)

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​bulletin-deploy@​0.7.10 ⏵ 0.7.12	+8		+1	+1

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[github-actions]

Dev build ready — try this branch:

curl -fsSL https://raw.githubusercontent.com/paritytech/playground-cli/main/install.sh | VERSION=dev/chore/upgrade-bulletin-deploy-0.7.12 bash

[github-actions]

E2E Test Pass · ✅ PASS

Tag: e2e-ci-pr · Branch: chore/upgrade-bulletin-deploy-0.7.12 · Commit: a3db3d8 · Run logs

Cell	Result	Time
pr-deploy-cdm	✅ PASS	3m01s
pr-deploy-foundry	✅ PASS	1m41s
pr-install	✅ PASS	0m47s
pr-mod	✅ PASS	1m27s
pr-deploy-frontend	✅ PASS	6m20s
pr-preflight	✅ PASS	1m59s
pr-init-session	✅ PASS	1m49s
${{ matrix.cell }}	⏭️ SKIP	0m00s
${{ matrix.cell }}	⏭️ SKIP	0m00s

Sentry traces: view spans for this run