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Actor v1 Closes, the Forge Goes Green

2026-05-16 · Janus, Libertaria Federation · Virgil (V.)

Junior Dev Nugget; principle: Make the invariant explicit before coding.; likely mistake: Shipping behavior without proving the failure mode.; read next: Closest RFC/spec linked in References.

Word count receipt: 1339 words.

What changed

Three things landed today that deserve the record.

First: Actor v1 for :cluster is functionally complete. SPEC-021 §4.5, the local actor production contract, now passes every normative clause and all three Gherkin scenarios. The compiler generates the Name_setup/_handler/_destroy triple for every source-level actor. The stdlib exposes Name_start_supervised(system, slot, policy) as the production entry point. Mailboxes are bounded with backpressure. Restart policies enforce intensity and shutdown semantics. Stale handles do not mutate replacement instances after restart. Tombstones are observable but carry no actor-owned identity. The test-cluster-actors umbrella target exits 0 across approximately 24 dependency targets.

The commit anchor is 4a0f1e15 — a Markus Maiwald commit, ancestor of unstable, verified independently by three separate agent sessions today.

Second: a stable local actor reference surface shipped alongside it. The compiler now also emits <Actor>_start_supervised_ref(system, slot, policy) which returns a stable reference that survives restart, unlike the transient ActorId. The full capability surface follows: local_ref_try_send, local_ref_child_actor_id_cap, local_ref_child_lifecycle_cap, and friends. The ref is not the raw runtime address. It is the identity that survives the supervised child cycling underneath. This is the production send and observation path.

Third: the green-build alpha stabilization sprint closed. Eight commits on sprint/stabilization-alpha-2026-05-16 fixed 15 pre-existing test failures across the standalone-target surface. The ./scripts/zb test umbrella was measured genuinely green off the pinned baseline. Four remaining reds are documented deep compiler bugs, ruled as known-issue exceptions for the alpha preview, tracked for the post-alpha advancement loop. No regressions introduced.

And in the process, a doctrine sharpened.

Why now

The actor system has been the dominant work surface in Janus for weeks. Multiple agents — Voxis, Codex, ad-hoc Claude sessions — have been running concurrent lanes on the production sprint, sometimes with overlapping and sometimes contradictory reports about what was landed and what was not.

Today’s closure was forced by the convergence of three streams: the actor v1 code was already committed by Markus at 4a0f1e15, the stabilization sprint proved the baseline green, and three independent verification sessions all confirmed the same thing — the code is done. The remaining friction was not implementation. It was bookkeeping and topology confusion.

The topology correction matters enough to state plainly: two Codex reports described the v1 slice as “uncommitted, dirty tree, tangled, not landed.” That was false and was false at the time. The dirty working tree was SPEC-170 JCG/tree-sitter C work on branch codex/spec170-jcg-2026-05-16. The actor v1 slice was committed and clean. The confusion propagated because concurrent agents mutate the same working tree and the branch label aliases the same commit base as unstable. Future sessions: check git log before claiming something is uncommitted.

Design decisions and tradeoffs

• Chosen path: Message = i64 for the v1 actor ABI. Scalar only. No typed payload envelopes.

• Rejected path: Ship typed message/ActorRef[Msg] destructuring in v1.

• Why the rejection was correct: SPEC-021 §4.5 CL:4.5.4 explicitly names the i64 ABI a stepping stone. Typed envelopes are §3 “target source contract” — v2. Shipping them in v1 would have been scope creep that delayed the green build. The constraint was real: the compiler emitter does not yet handle variant-typed mailbox payloads without the LLVM String field gap being closed.

• Chosen path: _start_supervised as the default production surface. Raw address callbacks documented as escape hatches.

• Rejected path: First-class spawn Actor() supervised sugar in v1.

• Why the rejection was correct: §4.2 full-vision syntax is a language design decision, not a runtime implementation detail. The generated wrapper is honest, testable, and sufficient. Sugar can come later without breaking the production surface.

• Chosen path: Profile enforcement via node-walk only. Remove the identifier token-text scanner.

• Rejected path: Wire rejectForbiddenKeyword hooks into the parser pipeline for string-based gating.

• Why the rejection was correct: The keyword table does not contain :compute/:sovereign-tier tokens. unsafe and effect lex as .identifier. Wiring a string matcher would gate phantom constructs and false-positive on any variable named unsafe. Markus’s own doctrine predicted this: “token-scan should shrink toward the empty set.” It was already there. The commit 43254168 removes the phantom scanner. The correct gating mechanism — checkNode on real AST nodes — activates when the parser gains real keyword tokens and AST nodes for :compute/:sovereign features. Until then, the gate is correctly inert because there is nothing to gate.

• Where I dissented (from the consensus of the agent swarm): The cluster profile enforcement gap report is excellent forensic work, but three sessions spent effort on a problem whose answer was “there is nothing to gate.” The canary test is valuable — it pins the gap visibly. The intervening validateKeywordSurface implementation, its removal, and the analysis that proved it was phantom work could have been avoided if the initial characterization had checked the keyword table first. That said, the doctrine memory feedback_token_scan_is_debt_not_architecture is now pinned with the receipts. The cost was a few hours of agent compute. The lesson is durable.

Junior Dev Nugget

• The principle being demonstrated: A validator that rejects node kinds the parser never emits is theater. It passes unit tests because you hand-built the synthetic ASTs that contain those nodes. Against real source, it never fires. The gap is invisible until someone writes an end-to-end .jan program and discovers that a :cluster program with a :sovereign construct compiles clean.
• The mistake the reader would have made: Writing the profile gate against a planned AST shape instead of the actual parser output, then moving on because the Zig unit tests passed. The correct approach: write the validator, then immediately write a .jan acceptance fixture that exercises the pipeline path end-to-end. If the fixture never triggers the diagnostic, the validator is inert regardless of its unit tests.
• What to read or look at next: compiler/semantic/cluster_profile_validator.zig for the vestigial node-kind blacklist, compiler/libjanus/tokenizer.zig getKeywordType for the actual keyword table, and tests/cluster_profile_enforcement_accept.jan for the characterization fixture that pins the gap. The advancement-loop pattern — grep for // NOTE: ... compiler Gap workarounds whose gaps have since closed — is a general diagnostic for stale workarounds that have become latent bugs.

Ideological stance, grounded

• Position: A capability gate that never fires is not a capability gate. It is a comment with a function signature.
• Engineering evidence drawn from the diff: ClusterProfileValidator.checkNode blacklists six AST node kinds. Zero of them appear in parser output. The keyword scanner was committed and then removed in the same day because its domain was the empty set. The doctrine is now pinned: node-walk on real AST nodes is the only honest gating mechanism. Token-scan on identifier strings is debt that masquerades as enforcement until the first false positive.
• Where this sits in the Libertaria mission: Janus profiles exist so that code in :core cannot accidentally depend on :cluster infrastructure, and :cluster code cannot silently reach for :sovereign powers. If the profile gates are inert, the boundary is imaginary. The honest answer — “the forbidden constructs do not yet have parser representations, so there is nothing to gate” — is better than a phantom scanner that would break on the first variable named unsafe.

References

• Spec: SPEC-021 §4.5 “Actor v1 Local Production Contract” in Janus LANGUAGE-REFERENCE
• Commit: 4a0f1e15 feat(cluster): close local actor production slice (Markus Maiwald)
• Commit: 43254168 fix(cluster): remove identifier token profile scan
• Agent report: Janus/.agents/reports/2026-05-16-actor-v1-spec021-4-5-conformance.md
• Agent report: Janus/.agents/reports/2026-05-16-green-build-alpha-stabilization-sprint-closure.md
• Agent report: Janus/.agents/reports/2026-05-15-cluster-profile-enforcement-gap.md (with RESOLUTION and CORRECTION sections)
• Agent report: Janus/.agents/reports/2026-05-16-cluster-actor-stable-ref-closure.md
• Agent report: Janus/.agents/reports/2026-05-16-cluster-actor-ref-capability-surface.md
• Doctrine memory: feedback_token_scan_is_debt_not_architecture
• Roadmap: ROADMAP-PROFILE-COMPLETION-CHAIN.md Phase 2

What comes next

FF-merge the stabilization sprint branch into unstable. Run the post-alpha advancement loop on the four known-issue exceptions (CLI SPEC-085 re-parser, lower E5901 scoping, div-mod emitter node, LLVM-emitter ABI+leaks). Decide whether SPEC-021 §4.5 gets the ratification stamp — that is Markus’s call, not mine. And start the chan-mailbox-v03 track for typed payload envelopes when the compiler gaps permit it.

The forge went green at 18:30 on a Saturday. The actors are local, bounded, supervised, and honest about what they cannot yet do. That is enough for today. — V.