Regenerate SDK from serverside-api v235.0.0 and fix generate.sh leftovers

[slavabobik]

Summary

./generate.sh was failing partway through and leaving the working tree in a broken, half-generated state. This fixes the script and lands a fresh generation from the current spec.

Why it failed: building chat-manager pulls in a very large Go dependency graph and needs tens of GB of scratch space. When it ran out, the Go compiler died with no space left on device — but only after the generator had already written part of its output, so every failed attempt left untracked leftovers behind.

Why leftovers accumulated: the script never removed anything before regenerating. Models dropped from the spec upstream simply stayed on disk forever. This regeneration prunes 124 such classes that no longer exist in serverside-api.yaml.

generate.sh changes

• Check free space on TMPDIR and the repo up front, and fail with a hint instead of dying mid-build.
• Build the generator before touching the SDK tree, so a compile failure can't leave partial output.
• Wipe generated models and webhook fixtures before regenerating, so stale schemas and events don't survive. models/framework is hand-written and deliberately preserved.
• Roll generated sources back via git if any generation step fails. The trap is released once output is coherent, so a compile failure is left in place to inspect rather than silently reverted.
• set -euo pipefail, resolve paths from the script location, and only apply the CallParticipant patch when that model is actually generated (it no longer is, which was printing an error on every run).

Regenerated output

Generated from chat at a3178a8796 (Release v235.0.0).

• New importer external storage endpoints on Common
• New models: ChannelContextResponse, DeleteUserMessagesRequestPayload, GetExternalStorageGCSResponse, UpsertExternalStorageGCSRequest, ModerationAnalysisFailedEvent
• Removed 124 stale model classes absent from the spec and unreferenced by the client

Test plan

• ./generate.sh runs end to end, BUILD SUCCESSFUL
• ./gradlew compileTestJava passes, so no test source referenced a pruned model
• Offline unit tests pass (241/242; the one failure is StreamHTTPClientTest needing STREAM_API_KEY/STREAM_API_SECRET, and it passes once those are set)
• Rollback verified by injecting a failure into the generation step: all 1547 models, the 8 hand-written models/framework files, and the fixtures were restored, and a planted untracked leftover was cleaned up
• Disk preflight verified via MIN_FREE_GB=999999 ./generate.sh, which exits 1 with the reclaim hint
• CI green

Note for reviewers

The 124 deletions are public classes, so this is technically a breaking change for anyone importing them. They were unreachable dead code — no endpoint returns or accepts them, and nothing in the client or tests references them.

I also had to install a Java 21 toolchain locally to build; the repo pins JavaLanguageVersion.of(21) and only JDK 25/26 were present. Nothing in the repo needed changing for that.

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