Companion to fangorn/anvil#362 / anvil PR #225 (dedicated runners so a deploy runner can live safely on the production host).

• anvil runner configure --dedicated — registers the runner with dedicated: true; the server then only hands it jobs whose runs_on names one of its user labels.
• anvil runner update <ID> --dedicated true|false — flips the flag on an existing runner.
• Fix: runner update --labels sent a comma-joined string where the server’s labels array column expects a JSON array — every labels update 422’d with a cast error.
• Fix: runner list/runner view read labels with as_str(), but the server sends an array — the LABELS column always rendered empty (this is why the fleet looked label-less while diagnosing the stuck deploy-prod job). view also shows Dedicated: yes when set.

Testing: cargo fmt, cargo clippy --all-targets clean, cargo test 27 passed. Verified against the live server that --json runner list shows the real label arrays the table was dropping.

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