## Summary
`X-OpenCode-Session` is only set by the OpenCode "Zen" provider. Other
providers use `x-session-affinity` instead. This change falls back to
`x-session-affinity` when `X-OpenCode-Session` is not present, so
sessions are correctly identified regardless of the provider used.
Ref: https://github.com/coder/coder/pull/26128
## Changes
- `aibridge/session.go`: Prefer `X-OpenCode-Session` (Zen), fall back to
`x-session-affinity` (other providers).
- `aibridge/session_test.go`: Add tests for precedence and fallback
behavior.
> Generated with [Coder Agents](https://coder.com) by @dannykopping
This follows #26098 by teaching AI Bridge to read OpenCode session IDs
from the X-OpenCode-Session header, so OpenCode requests are grouped
consistently in interception logs.
Adds unit and integration test coverage for the new header.
<details>
<summary>Coder Agents generated</summary>
This pull request was generated with Coder Agents assistance.
</details>
*Disclaimer: implemented by a Coder Agent using Claude Opus 4.6*
Porting https://github.com/coder/aibridge/pull/277 to coder/coder after
the [aibridge code move](https://github.com/coder/coder/pull/24190).
## Summary
Fixes client detection and session ID tracking for the [Charm
Crush](https://github.com/charmbracelet/crush) AI coding client.
## Changes
### Bug fix: User-Agent matching
The actual Crush user-agent is `Charm-Crush/{version}
(https://charm.land/crush)` (hyphenated), but `GuessClient` only checked
for `charm crush/` (space-separated). After lowercasing,
`Charm-Crush/0.2.0` becomes `charm-crush/0.2.0`, which did not match the
`charm crush/` prefix.
Now matches both formats for backwards compatibility.
### Session ID tracking
Adds an explicit `ClientCrush` case to `GuessSessionID`. Crush does not
currently send a session ID header to upstream AI providers, so this
returns `nil` (consistent with how `ClientZed`, `ClientRoo`, and
`ClientCursor` are handled).
### Tests
- Added `charm_crush_hyphen` test case for `GuessClient` using the real
user-agent format.
- Added `crush_returns_empty` test case for `GuessSessionID`.
This PR merges code from `coder/aibridge` repository into `coder/coder`.
It was split into 4 PRs for easier review but stacked PRs will need to
be merged into this PR so all checks pass.
* https://github.com/coder/coder/pull/24190 -> raw code copy (this PR,
before merging PRs on top of it, it was just 1 commit:
https://github.com/coder/coder/commit/70d33f33200c7e77df910957595715f81f9bec24)
* https://github.com/coder/coder/pull/24570 -> update imports in
`coder/coder` to use copied code
* https://github.com/coder/coder/pull/24586 -> linter fixes and CI
integration (also added README.md)
* https://github.com/coder/coder/pull/24571 -> added exclude to
scripts/check_emdash.sh check
Original PR message (before PR squash):
Moves coder/aibridge code into coder/coder repository.
Omitted files:
- `go.mod`, `go.sum`, `.gitignore`, `.github/workflows/ci.yml,`
`Makefile`, `LICENSE`, `README.md` (modified README.md is added later)
- `.github`, `example`, `buildinfo,` `scripts` directories
Simple verification script (will list omitted files)
```
tmp=$(mktemp -d)
echo "$tmp"
git clone --depth=1 https://github.com/coder/aibridge "$tmp/aibridge"
git clone --depth=1 --branch pb/aibridge-code-move https://github.com/coder/coder "$tmp/coder"
diff -rq --exclude=.git "$tmp/aibridge" "$tmp/coder/aibridge"
# rm -rf "$tmp"
```
Ben Potter
