Change State.Tool() to return value instead of pointer to copy

[ametel01]

Summary

• State.Tool() now returns (ToolState, bool) by value instead of (*ToolState, bool), eliminating the misleading pointer-to-copy pattern.
• Updated all call sites in discovery, executor, and state packages.

Test plan

• All existing tests pass without modification (they only read from the returned value)
• make verify passes

Closes #10

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6dcc0eed-7fc4-4048-83b2-d1193c1db94a

📥 Commits

Reviewing files that changed from the base of the PR and between 194e07a and 4fa0ce4.

📒 Files selected for processing (4)

• CHANGELOG.md
• internal/discovery/discovery.go
• internal/plan/executor.go
• internal/state/state.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/10-state-tool-return-value-semantics

📝 Coding Plan

• Generate coding plan for human review comments

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