The 40-hex sha stays the release, but nobody reads one. Entries may now add
`version: "1.4.0"` (free-form, <=32 chars, never parsed) and `image:` (an https
URL on raw.githubusercontent.com / github.com / *.githubusercontent.com).
Why GitHub-only: the Desktop catalog browser deliberately never fetches from
third-party hosts, and a raw URL pinned to the entry commit is as immutable as
the sha it decorates.
Readers updated together: PluginCatalogEntry + entry_from_mapping (drop with a
warning, entry survives), validate_plugin_catalog.py (admission error), the
site extractor (drop, never fatal), the /docs/plugins card (banner + version
pill + "1.4.0 @ abcd1234" pin), the CLI table/info (pin_label), the TUI-gateway
plugin row (catalog_version -> Desktop "Update to 1.4.0"), and the Desktop
catalog detail header (image).
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