cli: install git→kai import hooks by default; milestone bridge stays opt-in

[jschatz1]

Answers "should we default to git bridge?" by splitting the two directions the bridge bundled behind one opt-in:

git→kai import: now default ON

The post-commit/merge/checkout/rewrite hooks (importing commits as snapshots) install on plain kai init, gated by new config bridge.auto_import (default true; false both skips installation and makes kai bridge import a no-op).

Why this is the right default:

• This direction never writes to git — it only keeps the graph current. With drift now surfaced everywhere (v0.35.0), every non-kai commit produces stale-suspect annotations the user must clear by hand; default hooks make those effectively never appear.
• Precedent: init has always installed pre-commit/pre-push unconditionally.
• It's safe now because of the drift machinery: the hook import runs in a backgrounded subshell, so git commit latency is unchanged (measured: bare commit 30ms; with kai hooks ~0.77s, all of it the pre-existing pre-commit hook — the import adds ~a fork). A lost import self-heals via the watch daemon or inline catch-up.
• post-rewrite buffers stdin before backgrounding (git closes the pipe when the hook exits).
• Hook version bumped v5→v6 so kai doctor --fix rolls existing installs forward.

kai→git milestones: stays opt-in

kai init --git-bridge keeps its sentinel and now means only this direction. Kai must not author commits in the user's git history by default.

Also fixed: test suite was creating real repos on kaicontext.com

The runInit tests never set --no-remote, so a logged-in developer's local go test ./cmd/kai/ silently signed up temp-dir-named repos (e.g. jschatz1/001) and pushed to them on every full run. All init tests now force initNoRemote.

Verified

Plain kai init --no-remote installs all four import hooks; kai bridge status reports the milestone direction disabled; commit latency measured unchanged; a plain git commit converges the graph in the background within seconds. New tests pin the default-on/opt-out gating, the backgrounding, and the stdin buffering. Full cmd/kai + internal/config suites green.

🤖 Generated with Claude Code

[kaicontext]

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