feat(cli): export deployed contract IDs and transaction hashes to JSON

[gospeltout]

What does this PR do?

Adds deployment artifact JSON export capabilities to @bc-forge/cli under the CLI Deployment Orchestrator epic.

• Outputs deployed Contract IDs (vault, fee, etc.), WASM hashes, transaction hashes (e.g. fee contract linking TX), target network metadata, and ISO timestamps to deployments.json.
• Guarantees safe atomic file overwrites via temporary file creation, disk syncing (fs.fsyncSync), and atomic renaming (fs.renameSync) to prevent data corruption or partial file writes on overwrite.
• Introduces the export-deployments (alias export) command and adds the -o, --out <path> flag to bc-forge deploy.
• Adds unit tests for JSON building, atomic overwrites, nested directory creation, error state handling, and CLI command options.

Type of change

• Bug fix
• Feature
• Refactor
• Docs
• CI
• Chore

Checklist

• I ran pre-commit run --all-files locally and it passed
• All CI jobs pass on this branch
• I added or updated tests for new behaviour
• I updated relevant docs / comments
• No secrets or credentials are included
• No breaking changes to public APIs (or I've documented them)

Breaking changes?

No breaking changes. The -o, --out flag on bc-forge deploy is optional, preserving backward compatibility for existing scripts.

Related issues

Closes #702

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