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feat(invariants): dev-mode event-contract assertions + session-log freeze (RFC 005 pt 3, RFC 008)

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New @deepseek-ai/dsh-invariants plugin (pure listeners, off in prod) asserts
the event taxonomy at runtime — seq monotonicity, turn/step nesting, a
tool/result needs a prior tool/call (NOT the converse), legal agent/status
transitions — and deep-freezes logged event data so mutating history throws.
Seeded sessions are checked + frozen on session/created.

The real RFC 008 fix is always-on: deriveMessages now structured-clones the
content it emits, so the loop's sanctioned request/adapter mutation can no
longer reach back and rewrite the append-only log. The pervasive
DeepReadonly<T> type flip is rejected (compile-only, high-noise, castable) —
recorded in ADR 0012, which folds in RFC 008. Wired into both demos.
This commit is contained in:
Tianyi Cui
2026-06-13 23:25:12 +08:00
parent 11f85b4f88
commit 11a29fdefe
19 changed files with 626 additions and 11 deletions
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docs/rfc/008-immutable-public-surfaces.md
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# RFC 008: Deep-readonly public surfaces
Status: proposed
Status: implemented (revised) — the pervasive `DeepReadonly<T>` type flip was rejected in favor of an always-on `deriveMessages` clone plus dev-mode `Object.freeze` + invariants. See [ADR 0012](../adr/0012-dev-invariants-over-deep-readonly.md).
## Problem