feat(agentloop): sub-agent delegation (issue #153, v0 sequential) - #230
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What ships:
- cmd/sin-code/internal/agentloop/subagent.go (new)
- SubagentRequest: Goal + optional MaxTurns/MaxTokens overrides.
- SubagentResult: Summary + Verified + Turns + OpenCriteria
(never the full message history — the parent's context stays small).
- Loop.SpawnSubagent(ctx, *session.Store, req): forks a fresh
session, builds a child Loop that shares the parent's wiring
(Gate, Completion, hooks, lessons, ledger), inherits the
parent's budgets unless overridden, runs child.Run, returns
a result. Does NOT inherit RunOverride.
- cmd/sin-code/internal/agentloop/subagent_test.go: 6 tests
(nil-parent, nil-store, empty-goal, basic-success, budget-fallback,
budget-override).
Acceptance criteria (from #153):
- [x] spawn_subagent tool exists (the SpawnSubagent method).
- [x] The sub-agent's session is isolated from the parent's.
- [x] Only the summary is returned to the parent (never the
full history).
- [x] Per-subagent MaxTurns / MaxTokens are honored.
- [x] v0 ships sequential delegation; parallelism is a follow-up.
Hard mandates honored:
- M2: no new deps.
- M3: the sub-agent's verify-gate is the same as the parent's
(re-verified, defense in depth).
- M7: 6/6 tests pass under go test -race -count=1.
Refs: #153
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Implements issue #153 (Loop Engineering Lücke 4).
Loop.SpawnSubagentruns a subtask in an isolated session, returns a SubagentResult with summary + control fields only (never the full history).What ships
v0 vs v1
v0 (this PR): sequential delegation. One sub-agent at a time.
The issue body says: "Empfohlene Reihenfolge: erst sequentielle Delegation (unten), Parallelität als Follow-up."
v1 (follow-up): parallel delegation. The signature is already designed for it — one
SpawnSubagentcall per sub-agent, no shared state. v1 spawns N goroutines.Acceptance criteria
spawn_subagentmethod exists on LoopHard mandates
go test -race -count=1Closes #153