implemented sub flow support

[raphael-goetz]

Resolves: #184

[github-actions]

GitLab Pipeline Action

General information

Link to pipeline: https://gitlab.com/code0-tech/development/taurus/-/pipelines/2564384697

Status: Passed
Duration: 2 minutes

Job summaries

docs:preview

Documentation preview available at https://code0-tech.gitlab.io/-/development/telescopium/-/jobs/14616674890/artifacts/out/index.html

[Copilot]

Pull request overview

Implements sub-flow execution by function identifier (in addition to existing starting-node sub-flows), letting handlers receive a deferred call into another built-in function whose arguments are bound through SubFlowSettings (defaults, hidden, optional/required). Threads a new Thunk abstraction through the handler/executor/tracer stack, replacing the previous i64 node-id thunks.

Changes:

• Introduce Thunk { Node, Function } and FunctionThunk (handler/argument.rs) and update HandlerFn/ThunkRunner plus every handler signature to take &Thunk instead of i64.
• Compile sub_flow.functionIdentifier to a new CompiledThunk::Function and execute it in executor.rs via execute_function_thunk, resolving each setting (hidden → default, null → default, missing → default/null/T-CORE-000107).
• Switch tracing from node_id: i64 to a string target (node=.. / function=..), retire compiler error T-CORE-000106, add T-CORE-000107, and add fixture/engine tests.

Reviewed changes

Copilot reviewed 18 out of 19 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
crates/taurus-core/src/handler/argument.rs	New Thunk/FunctionThunk types; Argument::Thunk now carries a Thunk.
crates/taurus-core/src/handler/registry.rs	New ThunkRunner type alias; HandlerFn switched to it.
crates/taurus-core/src/runtime/engine/model.rs	CompiledArg::Deferred(CompiledThunk) with Node/Function variants.
crates/taurus-core/src/runtime/engine/compiler.rs	Compile function-identifier sub-flows; remove T-CORE-000106.
crates/taurus-core/src/runtime/engine/executor.rs	Dispatch Thunk execution; build/resolve function sub-flow settings; new T-CORE-000107.
crates/taurus-core/src/runtime/engine.rs	New engine unit tests covering function sub-flow semantics.
crates/taurus-core/src/runtime/execution/trace.rs	ArgKind::Thunk uses target: String.
crates/taurus-core/src/runtime/execution/tracer.rs	mark_thunk_executed matches by string target.
crates/taurus-core/src/runtime/execution/render.rs	Render thunk arg with target string.
crates/taurus-core/src/runtime/functions/*.rs	Update all handler signatures and test dummies to ThunkRunner/&Thunk.
docs/errors.md	Replace T-CORE-000106 row with T-CORE-000107.
flows/11_function_subflow.json	New fixture exercising functionIdentifier + hidden/default settings.
Cargo.lock	Consolidate to a single tucana version.

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