Fix all baseline code-review findings across the six shared libraries

Resolves the 35 findings from the 2026-06-01 baseline (commit 26ba1c7),
test-first for every behavioral change. +51 tests (331 -> 382 passing, 0 failed).

- Telemetry-001 (HIGH): RedactionEnricher now honours property removal, so a
  redactor that drops a key actually scrubs the secret from the event.
- Auth: LDAP validator ValidateOnStart; API-key verify no longer fails on a
  best-effort MarkUsed write or a corrupt scopes column (fail-closed); LDAP cert
  validation hook; KeyPrefix persistence aligned; README algorithm corrected.
- Health: Akka checks return Degraded (not throw) when the cluster isn't up yet;
  GrpcDependencyHealthCheck catch-all; null 'description' rendered; composite
  endpoint builder; XML docs shipped.
- Audit: CompositeAuditWriter no longer re-throws OperationCanceledException;
  TruncatingAuditRedactor over-redact scrubs Target + safe negative max; options
  record; XML docs shipped.
- Configuration: TryAddEnumerable idempotent registration; consistent port
  quoting; strict invariant port parsing; XML docs + README packaged.
- Theme: mobile toggle is now CSS-only (no Bootstrap JS); token/CSS hygiene;
  XML docs on the public parameter surface.

Shared-contract/spec docs updated where the code was the source of truth
(observability service.instance.id, MapZbMetrics, redactor reach). All changes
additive/back-compatible at v0.1.0. code-reviews bookkeeping follows separately.

ZB.MOM.WW.Theme/tests/ZB.MOM.WW.Theme.Tests/StaticAssetsTests.cs

@@ -1,4 +1,6 @@
 using System.IO;
+using System.Linq;
+using System.Text.RegularExpressions;
 
 namespace ZB.MOM.WW.Theme.Tests;
 
@@ -32,4 +34,36 @@ public class StaticAssetsTests
     [InlineData("ibm-plex-mono-500.woff2")]
     public void Fonts_are_vendored(string file) =>
         Assert.True(File.Exists(Path.Combine(Wwwroot, "fonts", file)));
+
+    // Theme-002: .chip-idle pairs the idle background with the matching --idle
+    // foreground token (per DESIGN-TOKENS.md), not --ink-soft.
+    [Fact]
+    public void ChipIdle_pairs_idle_foreground_with_idle_background()
+    {
+        var css = File.ReadAllText(Path.Combine(Wwwroot, "css", "theme.css"));
+        var rule = Regex.Match(css, @"\.chip-idle\s*\{[^}]*\}").Value;
+        Assert.Contains("color: var(--idle)", rule);
+        Assert.Contains("background: var(--idle-bg)", rule);
+        Assert.DoesNotContain("--ink-soft", rule);
+    }
+
+    // Theme-003: no hardcoded hex colours appear outside the :root token block in
+    // either stylesheet — every shade is a named token.
+    [Theory]
+    [InlineData("theme.css")]
+    [InlineData("layout.css")]
+    public void No_hardcoded_hex_outside_root_token_block(string file)
+    {
+        var css = File.ReadAllText(Path.Combine(Wwwroot, "css", file));
+
+        // Strip the :root { ... } declaration block(s) — the one place hex literals live.
+        var withoutRoot = Regex.Replace(css, @":root\s*\{[^}]*\}", string.Empty);
+
+        var hexLiterals = Regex.Matches(withoutRoot, @"#[0-9a-fA-F]{3,8}\b")
+            .Select(m => m.Value)
+            .ToList();
+
+        Assert.True(hexLiterals.Count == 0,
+            $"{file} has hardcoded hex outside :root: {string.Join(", ", hexLiterals)}");
+    }
 }