The systemd ExecStart carried every host-level setting as its own flag —
nine of them, including two escaped JSON blobs (the context-window map and
the model-price table). Collapse them into a single `--config <file>` JSON.
- Reuse the existing HiveEnv as the container-injected config shape (add
Deserialize + Default), and add a ServeConfig wrapper = flattened HiveEnv
plus the hive-c0re-local model_prices table (kept out of HiveEnv since it
is never injected into containers). serde(default) lets any field be
omitted and fall back to its canonical default.
- clap: add --config; the per-setting flags become optional overrides
(config file is the base, explicit flags win — preserves hivectl/debug
ergonomics and bare `hive-c0re serve`).
- Coordinator::open and cmd_serve now take the bundled HiveEnv, which drops
their too_many_arguments clippy allows. cmd_serve keeps a single
too_many_lines allow (inherent daemon-boot orchestration, not arg-driven).
- nix: write the config as JSON to the store + pass --config, so ExecStart
is one short line.
- Add a round-trip test proving the flatten + per-field defaults work.
Closes the ExecStart-length issue.
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