feat: regenerate from protocol v236.2.0 (pinned messages, predefined filters, permission writes, feed counts)

[mogita]

Problem

getstream-go was generated from protocol openapi-v235.17.2 and has drifted behind. Nothing in the repo recorded that, so establishing the baseline needed a bisect across protocol tags: regenerate against a candidate, check for an empty diff, repeat.

Solution

Regenerated against protocol openapi-v236.2.0, and made the source version part of the output so the next person does not repeat the bisect.

generate.sh now resolves the latest protocol release itself and generates from that release's spec instead of whatever commit ../chat happens to sit on, so the output always corresponds to a tag anyone can regenerate from. The spec is fetched to a temp dir and deleted on exit. The tag is recorded in .spec-version, along with the generator build, because the generator still comes from chat master and can move the output on its own. make openapi is gone; only the chat-manager build is needed. Running ./generate.sh is unchanged, and the only new dependency is jq, checked up front.

New endpoints: GetPinnedMessages, the predefined_filters CRUD set, Create/Delete/UpdatePermission, and GetFeedCounts. pinned_messages and predefined_filters are newly present in the spec rather than newly built, having previously been withheld from generated clients.

New fields on existing types: message_retention across the channel-type config and response shapes, min_text_length and min_word_count on ActivityProcessorConfig, matched_contributors on Classification, team on QueryTeamUsageStatsRequest.

No breaking changes, checked three ways: oasdiff breaking from v235.17.2 reports none; no spec path was removed; and a struct-level comparison of the generated Go shows 21 types added, none removed, and no field removed from any existing type. The 13 deleted lines are gofmt realignment and doc-comment expansions, not removals.

How to verify

1. cat .spec-version shows spec: openapi-v236.2.0.
2. ./generate.sh produces no diff, confirming the committed code matches that release.
3. go build ./... && go vet ./... && go test -short ./... all pass.
4. Confirm the removals are cosmetic: git diff -U0 origin/main -- models.go | grep '^-[^-]' is only realigned struct fields and expanded comments.

Review instructions

The generated-code diff is mechanical; the parts worth a human eye are generate.sh and .spec-version. Note the openapi- prefix filter when resolving the tag: protocol carries a second tag namespace (v1.49.0 and friends), so taking the newest tag outright picks the wrong one.