release(v4.0.0): Shade GA — V3.x consolidation + audit prep

V3.1 → V3.12 consolidated and tagged for the first GA release. Wire
format unchanged from 0.4.x — 4.0 peers interoperate with 0.4.x peers
byte-for-byte. The version bump is semantic: audit-cycle complete,
opt-in surface fully exposed, threat model refreshed for every new
surface.

Highlights:
- All 24 @shade/* packages bumped to 4.0.0 in lockstep.
- CHANGELOG 4.0.0 section is the canonical manifest of what landed.
- THREAT-MODEL extended (§10 fingerprint gates, §11 WebRTC P2P, §12
  Web-Worker boundary) + residual-risks table refreshed.
- OpenAPI now covers all 27 routes: prekey, transfer, KT, inbox,
  bridge, observer, /metrics, /healthz, /ready.
- MIGRATION 0.3.x → 4.0 documented + smoke-tested against
  shade migrate-storage on a real SQLite DB.
- docs/audit/REVIEW-BUNDLE.md + SCOPE.md ready for external reviewer.
- scripts/soak.ts harness for the GA-stable 2-week soak window.
- All V*.md plans archived under docs/archive/ with Status: Done.
- Voice/Video carved out into V5.0; 4.0 audit focuses on the frozen
  non-realtime stack.

Tests: TS 1000/1000 + Kotlin 11/11 cross-platform vectors green.
Docker: gt.zyon.no/stian/shade-prekey:4.0.0 builds and reports
  version 4.0.0 on /health.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/shade-observability/tests/attributes.test.ts

@@ -0,0 +1,96 @@
+import { describe, expect, test } from 'bun:test';
+import {
+  bytesBin,
+  laneCountBin,
+  peerHash,
+  safeAttribute,
+  UnsafeAttributeError,
+} from '../src/index.ts';
+
+describe('peerHash', () => {
+  test('produces stable 8-char hex', () => {
+    const a = peerHash('alice@example.com');
+    const b = peerHash('alice@example.com');
+    expect(a).toBe(b);
+    expect(a).toMatch(/^[0-9a-f]{8}$/);
+  });
+
+  test('different addresses produce different hashes', () => {
+    expect(peerHash('alice@example.com')).not.toBe(peerHash('bob@example.com'));
+  });
+
+  test('never echoes the address', () => {
+    const addr = 'alice@example.com';
+    expect(peerHash(addr).includes('alice')).toBe(false);
+    expect(peerHash(addr).includes('@')).toBe(false);
+  });
+});
+
+describe('bytesBin', () => {
+  test('bins by order of magnitude', () => {
+    expect(bytesBin(0)).toBe('≤4KB');
+    expect(bytesBin(4096)).toBe('≤4KB');
+    expect(bytesBin(4097)).toBe('4–64KB');
+    expect(bytesBin(64 * 1024)).toBe('4–64KB');
+    expect(bytesBin(64 * 1024 + 1)).toBe('64KB–1MB');
+    expect(bytesBin(1024 * 1024)).toBe('64KB–1MB');
+    expect(bytesBin(10 * 1024 * 1024)).toBe('1–10MB');
+    expect(bytesBin(100 * 1024 * 1024)).toBe('10–100MB');
+    expect(bytesBin(1024 * 1024 * 1024)).toBe('100MB–1GB');
+    expect(bytesBin(2 * 1024 * 1024 * 1024)).toBe('≥1GB');
+  });
+
+  test('handles invalid input', () => {
+    expect(bytesBin(-1)).toBe('unknown');
+    expect(bytesBin(NaN)).toBe('unknown');
+    expect(bytesBin(Infinity)).toBe('unknown');
+  });
+});
+
+describe('laneCountBin', () => {
+  test('snaps to {1, 4, 16, 64}', () => {
+    expect(laneCountBin(1)).toBe(1);
+    expect(laneCountBin(2)).toBe(4);
+    expect(laneCountBin(4)).toBe(4);
+    expect(laneCountBin(5)).toBe(16);
+    expect(laneCountBin(16)).toBe(16);
+    expect(laneCountBin(32)).toBe(64);
+    expect(laneCountBin(128)).toBe(64);
+  });
+});
+
+describe('safeAttribute', () => {
+  test('rejects PII-flavoured keys', () => {
+    expect(() => safeAttribute('shade.peer.address', 'x')).toThrow(UnsafeAttributeError);
+    expect(() => safeAttribute('shade.bytes.exact', 1)).toThrow(UnsafeAttributeError);
+    expect(() => safeAttribute('shade.plaintext', 'x')).toThrow(UnsafeAttributeError);
+  });
+
+  test('rejects address-like values', () => {
+    expect(() => safeAttribute('custom.tag', 'alice@example.com')).toThrow(UnsafeAttributeError);
+    expect(() => safeAttribute('custom.tag', 'device:abc-123')).toThrow(UnsafeAttributeError);
+    expect(() => safeAttribute('custom.tag', 'did:web:example.com')).toThrow(UnsafeAttributeError);
+  });
+
+  test('rejects oversized strings', () => {
+    expect(() => safeAttribute('ok', 'x'.repeat(257))).toThrow(UnsafeAttributeError);
+  });
+
+  test('accepts safe values', () => {
+    expect(safeAttribute('shade.bytes.bin', '4–64KB')).toEqual({
+      key: 'shade.bytes.bin',
+      value: '4–64KB',
+    });
+    expect(safeAttribute('shade.lane.count', 4)).toEqual({ key: 'shade.lane.count', value: 4 });
+    expect(safeAttribute('shade.retry.count', 0)).toEqual({ key: 'shade.retry.count', value: 0 });
+    expect(safeAttribute('shade.error.code', 'SHADE_TIMEOUT')).toEqual({
+      key: 'shade.error.code',
+      value: 'SHADE_TIMEOUT',
+    });
+    // hashes pass through
+    expect(safeAttribute('shade.peer.hash', 'abcdef01')).toEqual({
+      key: 'shade.peer.hash',
+      value: 'abcdef01',
+    });
+  });
+});