v0.16.5 — Services are the API

🌴 Palm Engine v0.16.5 — Services are the API

Domain services in palm/services/, per-service REST under /v1/api/…, MCP remounted by service domain. Breaking release for integrators on legacy /v1/wizards and monolithic MCP tool names.

Added

• palm/services/ — definitions, execution/flows, execution/providers, system with per-domain registry.py and dispatch() command-path grammar
• REST /v1/api/… — definitions catalog + CRUD, flow session REPL, provider invoke, system doctor/jobs
• MCP per-domain tools — palm_flows_*, palm_system_*, palm_definitions_*, palm_providers_invoke (26 tools total with pattern contributors)
• ProviderExecutionService — host.execution.providers.invoke() with provider validation
• Definitions CRUD — POST/PUT/DELETE on /v1/api/definitions/{flows,processes,resources}/…
• FlowSession / SessionContext — service-layer session handles; session_id terminology at API boundary

Changed

• host.internal → host.system (SystemService)
• host.execution.on(id) → host.execution.flows session API (dispatch, FlowSession)
• Explorer SSR and operator hints updated to /v1/api/flows/… and palm_flows_* tool names
• MCP prompts and docs/llms.txt agent guide rewritten for 0.16 conventions

Removed (breaking — no deprecation window)

• /v1/wizards REST surface and handlers/wizard.py
• Legacy catalog routes (/v1/flows, /v1/processes, /v1/resources, /v1/doctor, /v1/flows/validate)
• POST /v1/resources/invoke — replaced by /v1/api/providers/{provider}/{resource_ref}/invoke
• Orphaned monolith handlers handlers/catalog.py, handlers/resources.py
• Monolithic MCP tools (palm_submit_wizard, palm_inspect_instance, palm_wizard_input, palm_doctor, …)

Transitional (still mounted)

• /v1/jobs, /v1/instances, /v1/plans, /v1/snapshots on legacy monolith route table (not yet migrated to /v1/api/system)