ALTER AGENT not supported in grammar

[retran]

Summary

ALTER AGENT is not recognized by the parser. ALTER supports 12 other document types (entity, association, enumeration, notebook, OData client/service, styling, settings, page, snippet, workflow, published REST service) but agent is absent.

Reproduction

CREATE AGENT MyModule.VerifyAgent (Instructions: 'test agent');
-- succeeds
ALTER AGENT MyModule.VerifyAgent SET Instructions = 'updated';
-- Parse error: no viable alternative at input 'ALTERAGENT'

Expected

ALTER AGENT should allow modifying agent properties (Instructions, knowledge bases, MCP services) consistent with other ALTER operations.

Impact

Cannot modify agents after creation without DROP + re-CREATE.

[github-actions]

Issue Triage

Summary:
The ALTER AGENT statement fails to parse, preventing modification of agents after creation.

Checklist for bug report completeness

Required info	Present?	Details
mxcli version	❌	Not mentioned
Mendix version	❌	Not mentioned
Scenario (what the user was trying to do)	✅	MDL script: CREATE AGENT … then ALTER AGENT …
Expected output	✅	ALTER AGENT should succeed and modify agent properties
Experienced output	✅	Parse error: “no viable alternative at input 'ALTERAGENT'”
AI bug report (mxcli diag --bundle or session log)	❌	Not provided

What’s missing:
Please add the mxcli version (run mxcli --version), the Mendix version of the project you’re working with, and, if possible, the output of mxcli diag --bundle (or at least the session log) to help us reproduce the issue.

Thanks for reporting this! Once we have those details we can investigate further.

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