Design a constitutional rule engine for community governance (deferred area)

[Lakes41]

Difficulty: Expert
Type: feature

Background
The README lists "Constitutional rule engine" and "Complex moderation workflows / appeals / reinstatement" as separate deferred areas, distinct from the existing simple packages/policy-engine rule types (PUBLIC, MEMBERS_ONLY, ADMINS_ONLY, CONTRIBUTORS_OR_ADMINS).

Problem
Communities have no way to define higher-level, versioned governance rules (a "constitution") that constrain what lower-level policies or role/permission changes are even allowed to do (e.g., "suspensions always require two-admin approval" or "no role can be granted ADMINS_ONLY access without a documented reason"), nor a structured moderation workflow (suspend → appeal → reinstate) with auditable state transitions.

Expected outcome
A packages/constitution-engine (or similarly scoped) module lets each community define versioned governance constraints that validate proposed policy/role/permission changes before they're applied, plus a moderation-action state machine (active → suspended → appealed → reinstated/upheld) with every transition recorded as an auditable event.

Suggested implementation

• Design a small declarative rule format for constitutional constraints (e.g., JSON rules referencing action type, required approvals, cool-down periods) stored per community with versioning (so changing a community's constitution doesn't retroactively invalidate past decisions).
• Add a validation hook that runs before mutating admin actions (role/permission changes, suspensions) checking against the active constitution version; reject non-compliant actions with a clear reason.
• Design a moderation state machine (active → suspended → appealed → reinstated / upheld) as an explicit Prisma-backed model with allowed transitions enforced in code (not just convention), each transition emitting an outbox event.
• Add an appeals endpoint allowing a suspended member to submit an appeal, and an admin endpoint to resolve it (reinstate or uphold), both requiring the multi-approval pattern if the constitution mandates it.
• Write thorough tests: invalid transitions rejected, constitutional constraint enforcement (e.g., two-admin approval requirement), and versioning (an old decision remains valid under the constitution version active at the time it was made).
• Document the design, including tradeoffs and the intentionally-simple v1 rule format, in docs/.

Acceptance criteria

• Constitutional constraints can reject non-compliant admin actions with a clear reason
• Moderation state machine enforces only valid transitions
• Appeals flow works end-to-end (suspend → appeal → resolve)
• Constitution versioning does not retroactively invalidate past decisions
• Full design and rule-format documented in docs/

Likely affected files/directories

• packages/ (new constitution-engine package)
• packages/policy-engine/
• apps/access-api/prisma/schema.prisma
• apps/access-api/src/routes/
• docs/

[EngrEOOnoja]

I'd like to take this on. I'll design a small declarative constitutional rule format (action type, approval counts, cool-downs) with per-community versioning so past decisions stay valid under the constitution active at decision-time, build a Prisma-backed moderation state machine enforcing only valid transitions with outbox events on every change, add a validation hook that gates both policy/role changes and moderation transitions against the active constitution (rejecting non-compliant actions with a clear reason), and implement the appeals flow end-to-end with multi-approval support where mandated — with tests covering invalid transitions, constraint enforcement, and version-pinning correctness.

[grantfox-oss]

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Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #277)
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