Phase 2: route terminal runtime IPC through registry

[parsakhaz]

Summary

• route runtime-owned panel, terminal, session script, and logs script IPC handlers through PaneCommandRegistry
• keep local adapter commands direct: sessions:open-ide, terminal:clipboard-paste-image, and browser-panel:register-webview
• extend registry binding tests to lock the ownership split in place

Validation

• pnpm typecheck
• pnpm lint
• CI=1 pnpm --filter main test
• PANE_DIR=/tmp/pane-phase2-terminal-runtime xvfb-run -a pnpm test:ci

Review

• implementation review pass completed before opening this PR
• no blocking findings for this slice

Notes

• this is still a partial of Phase 2 Task 2; session.ts and git.ts daemon-owned channels remain for later reviewed PRs

[parsakhaz]

@codex review

[parsakhaz]

@claude review

[chatgpt-codex-connector]

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