Add ARCHITECTURE.md §"Council Voice/Council Interface — Lifecycle Type
Divergence Decisions (v0.4)": documents P1-1 (Proposal/VoteOption absent,
deferred to v0.5+ governance runtime — feat: rejected by D-001), P1-2
(SignalKind 4-vs-5: the 4-source shape is intentional per AUDIT rationale;
Freeholder is eligibility, Guild is council tier, Capital is committed-
capital per vision §9.1), P2 (bearers ValidateGenesis no-op correct per spec).
test(council): TestSignalKindShapeIntentional regression guard (REQ-031)
Add intent-assertion test locking the 4-source SignalKind shape with the
AUDIT §193 P1-2 rationale in the doc comment. A future agent changing
SignalKindCount 4→5 must update this test, surfacing the rationale. No
locked-const change, no production .go files modified (D-050).
Verification: go test ./... green; only types_test.go modified in x/**.
---ci---
project: oy
phase: 2
milestone: v0.4
status: execute
tag_base: v0.3.x
milestone_type: nfr
reqs: [REQ-031]
---/ci---
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