ci: optimize CI pipeline with parallel jobs and caching

[0xApotheosis]

Description

Optimizes the CI pipeline through 5 incremental changes that reduce total CI time by parallelizing work and adding caching:

1. Multi-threaded vitest — Remove singleThread: true constraint to allow parallel test execution across threads
2. Consolidated workflow with parallel jobs — Replace 3 workflow files (bootstrap + pr + cloudflare) with a single ci.yml that runs lint, type-check, test, and deploy as parallel jobs. Packages are built once and shared via artifact upload
3. Incremental TypeScript checking — Enable incremental: true and cache tsconfig.tsbuildinfo between runs so tsc skips unchanged files
4. Concurrent test suites — Run test:packages, test:web:main, and test:web:side-effects concurrently using the existing concurrently dependency
5. ESLint cache persistence — Cache .eslintcache between CI runs so ESLint skips re-linting unchanged files

Before

bootstrap.yml → install-and-cache → pr.yml (serial: commitlint → build:packages → lint → type-check → test)
                                  → cloudflare.yml (install again → build:web → deploy)

After

ci.yml → build-and-install (install + build:packages + upload artifact)
       → lint (parallel, with ESLint cache)
       → type-check (parallel, with tsbuildinfo cache)
       → test (parallel, with concurrent sub-suites)
       → deploy (parallel, reuses packages artifact)

Issue (if applicable)

N/A — performance optimization

Risk

Low risk. CI workflow changes only affect the CI pipeline itself. The vitest threading change could surface latent race conditions in tests, but side-effects tests are already isolated in their own config.

What protocols, transaction types, wallets or contract interactions might be affected by this PR?

None — CI-only changes.

Testing

Engineering

• Verify all CI jobs pass on this PR (lint, type-check, test, deploy)
• Confirm lint/type-check/test run in parallel (visible in GitHub Actions UI)
• Confirm deploy job still correctly builds and deploys for whitelisted branches

Operations

• 🏁 My feature is behind a flag and doesn't require operations testing (yet)

CI-only changes, no user-facing impact.

Screenshots (if applicable)

N/A

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ci/pipeline-optimizations

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[0xApotheosis]

No meaningful change, closing.