feat(temporal): resolve executor struct-field dispatch

[avfirsov]

What

Resolves Temporal dispatch where the activity/workflow name is a receiver field whose literal is set at struct construction:

type ActivityExecutor struct{ ActivityName string }
func (e ActivityExecutor) Run(ctx workflow.Context) {
    workflow.ExecuteActivity(ctx, e.ActivityName)        // name = receiver field
}
exec := ActivityExecutor{ActivityName: "ChargeCard"}     // the literal lives here

The dispatch only sees e.ActivityName (not a literal), so it never resolved. This joins the dispatch to the construction-site literal by (receiver type, field).

How

Extractor (golang.go / golang_temporal.go):

• a fieldstr tree-sitter pattern collects Type{Field: "literal"} struct-field assignments, emitted as via=temporal.executor-field marker edges carrying executor_type / executor_field / executor_value;
• the dispatch stub is stamped temporal_name_field + temporal_recv_type when the dispatch argument is <receiver>.<field>;
• helper goCompositeLiteralType; a recvTypeByID map; and the call AST node on the deferred-call struct so the calls loop can inspect the dispatch arg.

Resolver (temporal_calls.go):

• resolveTemporalExecutorFields joins a dispatch's (recv_type, field) to a construction literal and rewrites the dispatching method's stub name to that literal — so the existing sweep lands it on the registered handler and callers of the activity surface the dispatching method (not the constructor). Wired at the top of ResolveTemporalCalls; self-guards; recompute-safe; unique-or-nothing on conflicting literals (matching the const-deref policy).

Scope

• Only executor-field resolution. Cross-language / const-deref / env-default / wrapper-following are untouched.

Tests

• resolver unit (field-meta stub + executor-field marker → resolved edge),
• extractor unit (temporal_name_field/temporal_recv_type on the stub; executor_* on the marker),
• end-to-end index→resolve test on real Go source.

go build ./... and go test -race ./internal/resolver/... ./internal/parser/languages/... ./internal/indexer/... pass.

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