Add a read-only view exposing the current staking state

[mikewheeleer]

Expose staking

Description

Callers can't read staking state. This issue adds a read-only view.

Requirements and context

• Repository scope: Agentpay-Org/Agentpay-contracts only.
• Add a read-only view returning the current staking state without mutating storage.
• Return a sane default before init.
• Cover values and pre-init default in tests.

Suggested execution

• Fork the repo and create a branch
• git checkout -b feature/staking-91-view
• Implement changes
  • Write code in: the relevant module.
  • Write comprehensive tests in: cover the new behaviour and edge cases.
• Test and commit

Test and commit

• Run cargo fmt, cargo clippy --all-targets -- -D warnings, and cargo test.
• Cover edge cases: values after set, default before init.
• Include the full test output in the PR description.

Example commit message

feat(staking): add read-only view

Guidelines

• Minimum 95 percent test coverage for impacted modules.
• Clear, reviewer-focused documentation.
• Timeframe: 96 hours.

Community & contribution rewards

• 💬 Join the AgentPay community on Discord: https://discord.gg/eXvRKkgcv
• ⭐ This is a GrantFox OSS / Official Campaign task and may be rewarded. When your PR is merged you'll be prompted to rate the project — a 5-star rating is much appreciated.