fix(cli): scope interactive terminal state

[marius-kilocode]

Interactive terminal state previously relied on a per-instance singleton, which made lifecycle ownership harder to reason about and left initialization vulnerable to concurrent first access. This change provides directory-scoped terminal services with coalesced initialization and explicit PTY cleanup when an instance or runtime scope closes.

The terminal API and behavior remain unchanged for launch, input, resize, close, takeover, abort, output, and per-directory isolation. Focused lifecycle tests cover concurrent initialization, cross-directory isolation, and disposal cleanup.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (4 files)

• .changeset/scoped-interactive-terminal-state.md
• packages/opencode/src/kilocode/interactive-terminal/index.ts
• packages/opencode/test/kilocode/interactive-terminal.test.ts
• script/architecture-allowlist.json

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_{Reviewed by grok-4.6 · Input: 196.1K · Output: 115.2K · Cached: 1.5M}

_{Review guidance: REVIEW.md from base branch main}