Make shell-hook prompting and state tracking idempotent

[ametel01]

Summary

• Suggestions() now accepts persisted state and skips tools with applied or declined hook status
• ApplyConfirmedSuggestions() unconditionally reconciles state to applied, even when the init line already exists in the rc file
• Re-running atb install no longer re-prompts for hooks that were previously applied or declined

Closes #26

Test plan

• TestSuggestionsSkipsAlreadyApplied — applied hooks suppress re-prompting
• TestSuggestionsSkipsDeclined — declined hooks suppress re-prompting
• TestSuggestionsIncludesPreviouslySuggested — suggested-but-unresolved hooks still prompt
• TestApplyReconcilesToAppliedWhenLineAlreadyExists — pre-existing rc line reconciles state
• All existing tests pass, golangci-lint clean

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3ad5f482-a77a-4f94-934c-6b3f1c429e06

📥 Commits

Reviewing files that changed from the base of the PR and between fab10b5 and 273446d.

📒 Files selected for processing (4)

• CHANGELOG.md
• cmd/atb/runtime.go
• internal/shell/shell.go
• internal/shell/shell_test.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/26-idempotent-shell-hook-prompting

📝 Coding Plan

• Generate coding plan for human review comments

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