feat: add v0.6 fee-aware commands

[MuncleUscles]

Adds deploy/write fee options, estimate-fees with simulation report output, and tests for the M5/v0.6 tooling train. Validated locally with npm test -- --run and npm run build.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f938e80e-7317-4267-8a28-39d0e40dbd1d

📥 Commits

Reviewing files that changed from the base of the PR and between 82b7958 and 59352eb.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (18)

• README.md
• package.json
• src/commands/contracts/deploy.ts
• src/commands/contracts/estimateFees.ts
• src/commands/contracts/fees.ts
• src/commands/contracts/index.ts
• src/commands/contracts/write.ts
• src/commands/localnet/validators.ts
• src/lib/clients/jsonRpcClient.ts
• tests/actions/deploy.test.ts
• tests/actions/estimateFees.test.ts
• tests/actions/validators.test.ts
• tests/actions/write.test.ts
• tests/commands/deploy.test.ts
• tests/commands/estimateFees.test.ts
• tests/commands/write.test.ts
• tests/libs/jsonRpcClient.test.ts
• tsconfig.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/v06-fees-tooling

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