0.5.3 — sandbox staging, group history, catalog image

New sidecar (group-context API). After updating, re-run setup so the prebuilt refreshes (or let setup download v0.5.3 Release assets).

Fixes

• Hermes sandbox / Docker could not read inbound Vector attachments. Files are hardlinked into Hermes mount dirs (images/vector, attachments/vector) so the agent and vision can open them.
• Multiplexed secondary profiles inherited the default bot’s VECTOR_*. Reads go through the active profile secret scope; the sidecar child gets that profile’s env only.

Added

• Optional group-channel history on mention turns (VECTOR_GROUP_CONTEXT=1 / vector.group_context.enabled). Off by default. Puts recent channel lines on MessageEvent.channel_context so the bot can follow the room without starting turns for unaddressed chatter.
• Plugin catalog image vector-hermes-agent-plugin.png.

Changed

• Adapter split into an internal/ package (register() remains the Hermes entry).
• README install notes oriented at the plugin catalog.

Upgrade

hermes plugins update vector-platform
hermes gateway setup    # refresh sidecar to v0.5.3
hermes gateway restart

Enable group history when you want it:

# env
VECTOR_GROUP_CONTEXT=1
# or config
# vector.group_context.enabled: true

Full notes: CHANGELOG.md.

Full Changelog: v0.5.2...v0.5.3

Full Changelog: v0.5.2...v0.5.3