Why:
svc.sh grew into a three-kind service manager with database operations,
but its only documentation was a flat --help wall of text; the user asked
for a complete usage document and a better help experience.
Evidence:
- docs/svc.md: 14-section manual (prerequisites, quick start, concepts
and directory layout, per-command reference for service/global/db
commands, deploy sources, database operations handbook, configuration
layering, registry fields and event types, safety boundaries, exit
codes, troubleshooting table, recipe index) — every claim cross-checked
against the implementation from the previous two rounds.
- Help layering: no-args and -h print a one-screen overview; --help
renders the header comment reorganized into 7 labeled sections; the new
"help [topic]" command deep-dives eight topics (model, deploy,
lifecycle, db, dbops, config, examples, safety); usage errors now show
the short overview plus a pointer to --help / help / docs/svc.md.
All topics verified to render; unknown topic exits 2.
- No runtime behavior changed: end-to-end db lifecycle regression
(create → start → backup → status → stop → rm --purge) passes after the
refactor.
- Makefile help and README's documentation section point to docs/svc.md.
Impact:
Documentation-only plus display-layer changes; command semantics,
exit codes and file formats are untouched. Maintenance note: behavior
changes must now update both --help and docs/svc.md.
Refs: .task/feature-svc-docs-help.md（任务卡=PR 描述）
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