fix(linear): stabilize agent session event threads - #885
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…termined comment mentions (#232) Linear agent sessions now route every event to one stable thread, linear:{issueId}:s:{agentSessionId}, instead of one :c:{comment}:s:{session} thread per source comment. Ports upstream 3d2cb22a (vercel/chat#885, chat@4.40.0): rootless sessions are dispatched with a synthetic root comment, creator-less sessions are authored by linear-automation, prompted events fall back to the activity id, and fetch pages agentSession.activities for sessions with no root comment. Ports the Linear half of fcdc1c9e (vercel/chat#946, chat@4.41.0): agent-session comments are is_mention=True, and ordinary comments leave is_mention unset so core @mention detection runs. Divergence: the activities query is raw GraphQL, checked against Linear's published schema (no Python @linear/sdk). Documented in docs/UPSTREAM_SYNC.md. Consumer impact: new agent-session events use the stable session thread id. Stored old :c:...:s:... ids still decode to the same session, so posting to them still works. Closes #232
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Summary
Route every event in a Linear agent session to the stable issue/session thread instead of deriving a new thread from each source comment. Also accept sessions created without a root comment and attribute creator-less sessions to a distinct Linear automation identity instead of the bot itself, which previously caused automation-created sessions to be dropped as self-messages.
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