Release v0.1.2

[github-actions]

Release v0.1.2

Merging this publishes the image, tags the commit and creates the GitHub Release.

Before merging:

• The notes below describe what a deployment does differently
• The smoke journey passed against a licensed deployment, and the result is
  pasted in a comment: bash scripts/start.sh && bun run test:smoke,
  with OPENBOT_SMOKE_COOKIE set to a signed-in session (docs/releasing.md)

Merging runs the full suite against this commit before it builds, so there is
nothing to check about CI here. The journey is the part CI cannot do: it needs a
licence, and a licence belongs to the machine it was issued for.

### CopilotKit 1.77 and AG-UI 1.0

OpenBot now runs on CopilotKit 1.77.0 (`@copilotkit/runtime`, `react-core` and `a2ui-renderer`,
from 1.73.1), which carries the Intelligence client, and on AG-UI 1.0 (`@ag-ui/core` and
`@ag-ui/client` 1.0.1, from 0.0.59). A managed Intelligence project needs nothing changed; it is the
client in the server that moved. Among what comes with it: thread naming falls back to the first
message, the realtime connection keeps its place across a repeated checkpoint, an interrupt resume
gets a run id of its own, and generated A2UI controls no longer submit the page's own forms.

Bots served from their own endpoint keep working as they are. AG-UI 1.0 still accepts the earlier
event shapes, so `agent-bot`, `agent-langgraph` and the Python Bots were not changed.

A tool result's `error` field is gone from the `TOOL_CALL_RESULT` event, because AG-UI 1.0 does not
define one. The refusal is still in the result's text and on the tool message, which is where a
Bot's next turn reads it.