fix(desktop): expose linked-agent instance editor

[marklyonx-star]

Summary

• expose the existing owner-only instance editor as a distinct Edit instance action on linked-agent profiles
• preserve Edit definition as the definition route and reuse the shipped typed instance-editor event
• add routing and parallelism-save coverage proving the instance write uses update_managed_agent and never update_persona

Verification

• test-first red: both new cases failed before implementation because user-profile-edit-instance did not exist
• pnpm exec playwright test tests/e2e/edit-agent.spec.ts: 12 passed
• pnpm test: 4,583 passed across 67 desktop suites
• bin/just ci: passed, including Rust, desktop, web, Tauri, and 1,261 Flutter tests
• Playwright visual checks at 1440x1000 and 390x844: action row visible with no overlap or truncation

Scope

• no propagation behavior changed
• no live agent, credential, automation, or runtime state changed
• no config-model or persistence contract changed, so the feature AGENTS.md capability inventory remains current
• house fork only; no upstream submission without a separate approval

Review

Harper.X second-eye requested for owner gating, definition/instance routing, and the parallelism-save command boundary.

[coderabbitai]

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