feat(schema): upgrade ACP schema from v0.10.8 to v0.11.2

[Nemtecl]

Summary

Upgrades the ACP schema from v0.10.8 to v0.11.2, regenerates all derived code, and wires up new protocol features.

Key changes:

• New stable methods: session/list (previously unstable), session/close (new, unstable)
• New types: CloseSessionRequest/Response, KillTerminalRequest/Response, FileSystemCapabilities, SetSessionConfigOptionSelectRequest, SetSessionConfigOptionBooleanRequest, AuthMethodEnvVar, AuthMethodTerminal, SessionConfigBoolean
• Renamed types: KillTerminalCommandRequest/Response → KillTerminalRequest/Response, FileSystemCapability → FileSystemCapabilities, SetSessionConfigOptionRequest split into typed select/boolean variants
• Regenerated schema.py and meta.py via make gen-all

Testing

• make test passes (all existing tests + new test_list_sessions_stable and test_call_unstable_protocol / test_call_unstable_protocol_warning updated for new stable/unstable routing)
• make check passes (ruff lint + format)

Docs & screenshots

Example files (examples/client.py, examples/gemini.py) updated to use renamed types.

Checklist

• Conventional Commit title (e.g. feat:, fix:).
• Tests cover the change or are not required (explain above).
• Docs/examples updated when behaviour is user-facing.
• Schema regenerations (make gen-all) are called out if applicable.

[PsiACE]

Thank you for your contribution. It looks great. I’ll merge it first and then do some cross-language comparisons.

[Nemtecl]

@PsiACE Do you think we could have a release so that I can already try it out ? Even if it's a beta release or any other format ?

Can't wait to try this out

[PsiACE]

hi @Nemtecl , I’ve just released version 0.9.0a1 for testing. Let's give it a try

pip install agent-client-protocol==0.9.0a1

[Nemtecl]

Hi @PsiACE thanks !
uv is not happy with pre-release dependency in pyproject.toml 😢

So far, the tests I did with the SDK are grerat ! Do you think we could move to a 0.9.0 🙏 ? Happy to help if you find a major bug / need a migration guide

[PsiACE]

Do you think we could move to a 0.9.0 🙏 ?

Thanks @Nemtecl I'm currently doing a final review and closing some long-standing PRs; I expect the new version to be released within 24 hours.