chore: pre-migration snapshot

Fleet monitoring/control plane: UI, node agent, ops wiring

ASSURANCE.md

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+# Assurance Run — 2025-12-18
+
+- Commit: 352a178aff92b35d0771965bea99c94984c492a4
+- Toolchain: `rustc 1.92.0 (ded5c06cf 2025-12-08)`, `cargo 1.92.0 (344c4567c 2025-10-21)`
+- Host: `macOS / Apple Silicon`
+
+| Check | Status | Notes |
+| --- | --- | --- |
+| `cargo fmt --check` | ❌ | rustfmt wants to wrap long chains and struct literals (e.g. `command-center/src/routes.rs`, `command-center/src/logs.rs`, `node-agent/src/main.rs`). No changes applied; rerun `cargo fmt` to adopt the default style. |
+| `cargo clippy --all-targets --all-features -- -D warnings` | ❌ | Fails on unused variables (`command-center/src/routes.rs:954`), unused field/method (`state.rs:108`, `state.rs:735`), log reader patterns (`logs.rs:48`, `logs.rs:371`), derivable `Default`, `io_other_error`, etc. Exact diagnostics captured from the run. |
+| `cargo test` | ✅ (warn) | Tests pass; same unused-field/unused-variable warnings as above remain. |
+| `cargo check --release` | ✅ (warn) | Release build succeeds with the same warnings. |
+
+Notes:
+- Removed stale `target/` directory (now rebuilt by `cargo test`).
+- No changes were saved to source files.