v0.1.0

The first stable release of the 0.1.0 line, summarising it rather than only the
delta since alpha.1.

tg gained the surface searchy needed to leave its third-party client: media
sends, inline mode, link-preview control and the chat and action constants that
went with them. Nothing that already existed moved, so the three bots already on
this module are unaffected by any of it.

Below, the entries added after alpha.1 was tagged. The media and inline work is
described in the alpha.1 section.

Added

• docs/releases.md gained a Deploying section, and AGENTS.md points at it.
  Releasing was documented; deploying was not, in any repository in the family —
  the process stopped at "deploy it" and never said how. That gap mattered more
  after the stacks moved from building on the host to pulling a published image,
  because the procedure changed on the same day. The section names this stack's
  host directory, its env file, the variable that selects the image, the networks
  it needs, and what a rollback actually is.