`heph daemon start`/`restart` previously hardcoded `hephd --mode local` and
only wired the bare `--self-update` bool — the poll interval and all spoke/hub
sync config (`--hub-url`, `--http-addr`, `--oidc-*`) could not be set on the
managed service without hand-editing the plist/unit (which a later
start/restart would clobber).
Generate the hephd arg vector from a DaemonConfig and add the corresponding
`heph daemon start/restart` flags: --mode, --hub-url, --http-addr,
--oidc-issuer, --oidc-audience, --oidc-client-id, and
--self-update-interval-secs. Regenerating now reads the existing service file
and preserves any flags not passed (start as well as restart), so a bare
invocation never silently drops baked config.
Closes the "pass through --self-update-interval-secs" and "bake hub/spoke
config into the generated service" backlog tasks.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Collapse the eight Mikado scaffolding cards (+ goal card) into one
user-facing how-to, docs/how-to/self-update.md: what self-update is and
how to enable it. The per-card breakdown was build-time scaffolding, not
documentation. Keeps the changelog fragment; updates the how-to index.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
