chore: Sync from internal → open source (2026-10-13)

[setu4993]

Summary

Sync from the internal repo up to aea206d9.

Language & syntax

• Workflow syntax: workflow-scoped steps and actions, @workflow transition targets, and compiler support for workflow nodes (also referenceable from GBA agents)
• say statement
• Deterministic end_session directive
• Keyword arguments in functions, plus a concat function
• Conditional system instructions; additional_system_instructions on Slack connections
• Field-level mapping in deterministic render syntax; auto-complete in when-render statements
• async_mode action flag; non-blocking tools and action caching
• Outcome-based billing mode
• id type allowed in action inputs/outputs

Lint & diagnostics

• Warn when an ask for target can never be gathered
• Error on chained actions after utils.setVariables
• Warn when artifact echoes follow a terminal status
• Recommended-prompt validation moved from compile time to authoring time
• Missing : error for if / else blocks without a colon
• Variable targets surfaced in diagnostics (data.target); diagnostics de-duplicated across parsing
• undefinedReferenceDiagnostic: found is now the trailing optional parameter, so callers pinned to an older @agentscript/language keep compiling (follow-up to feat(lsp): add quick fix for misspelled @namespace references #87)

Compiler

• Orchestrator model_config; params under model_config (param overrides only); parallel_tool_execution policy
• file_references emitted from @system_variables.uploaded_files
• State updates emitted as set operations; adjacent same-gate state updates merged
• require_user_confirmation emitted only when set; LLM-filled inputs rejected on deterministic run
• Empty additional_locales allowed; empty escalation flows skipped
• Shared type guards for the Action / HandOffAction / AgentNode unions; schema serializer exposed (including enums)
• Generated Zod schema updated to the latest DSL

Tooling

• Playground can compile to camelCase
• VS Code: skip @dialect auto-detection for agentfabric files

Also includes the regenerated compiler fixtures and parser updates that accompany these changes.

Review notes

• Single commit: 814 files (+52,216 / −51,957; 94 added, 718 modified, 2 deleted). Most of the churn is regenerated compiler fixtures.
• The Linux tree-sitter prebuilds (packages/parser-tree-sitter/prebuilds/linux-{x64,arm64}) are refreshed to match the current grammar; the previous ones predated the say statement. The stale, untagged @agentscript+parser.node duplicates are removed so node-gyp-build resolves the current binary deterministically.
• gitleaks and the sync compliance checks passed; build and tests pass.
• test(language/lint): add unit tests for unreachable-code pass #65, feat(lsp): add quick fix for misspelled @namespace references #87, fix(compiler): preserve prototype-named keys during camelCase conversion #89, and test(language/lint): add unit tests for expression-validation pass #90 are already imported internally and are not reverted.