feat(desktop): expose complete settings and session records

[killswitch-GUI]

Summary

• expose the complete managed settings contract in Desktop, including full MCP, provider, model, and telemetry round trips
• list and inspect context snapshots plus every durable session-map resource family
• preserve renderer-owned transports across managed settings restart boundaries and surface apply failures
• prepare the Rust workspace and native dependency graphs for v0.10.10-preview.6

Validation

• cargo xtask check rust
• cargo test --manifest-path apps/desktop/src-tauri/Cargo.toml --locked --lib (203 passed)
• npm run check in apps/desktop (268 unit + 44 security/contract tests)
• Playwright browser acceptance (36 passed), including full settings coverage, context snapshots, durable resources, responsive layout, and overflow checks
• cargo xtask pr --base origin/main (Rust, SDK, Desktop, docs, and dependency tiers passed)

Release

• bumps the workspace, internal Rust dependency pins, Desktop native dependency pins, fuzz dependency, and lockfiles to 0.10.10-preview.6
• leaves stable npm, PyPI, and Go SDK package versions unchanged because preview tags do not publish registry SDKs

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[chatgpt-codex-connector]

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