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nikita-ashihmin 0581b9cf39 feat: align typed session failures with AIR protocol (#992)
## Summary

- align `_meta.jetbrains.air.sessionFailure` with AIR's
transcript-record protocol: `id`, `revision`, broad `category`, explicit
`severity`, `title`, optional `details`, and `actions`
- forward Claude's actual user-facing assistant/result text as `title`;
use adapter-authored fallback text only when Claude provides no message
(transport failure, worker EOF, or an internal invariant)
- reduce categories to `connection`, `access`, `limit`, `request`,
`service`, and `unknown`
- limit suggested actions to `retry`, `login`, and `new_session`
- update one transcript record through `id + revision`, keep resolved
entries in history, and remove clear/tombstone updates
- suppress duplicate assistant failure prose only for clients that
negotiated typed failures; preserve legacy ACP behavior otherwise
- restore synthetic usage-limit failures from session history with their
exact stored Claude text
- document negotiation, delivery carriers, identity/revision behavior,
mappings, recovery, and compatibility in the extension spec

## Validation

- `npm run check`
- `npm run build`
- `npm run test:run` — 777 passed, 26 skipped
- `git diff --check`

## Tracking

[IJAI-993](https://youtrack.jetbrains.com/issue/IJAI-993)
2026-08-14 17:29:39 +04:00
..
2026-08-07 15:16:50 +02:00