diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..f4fa620
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,42 @@
+name: CI
+
+# This package could not be depended on by anything, and nothing said so.
+#
+# Its manifest opened with `{` instead of `.{`, named itself `zig_hdc` where an
+# enum literal was required, carried no fingerprint, and gave its dependency a
+# url with no hash. Its build script also passed `root_source_file` to addTest,
+# which stopped being a field in 0.15. Any of those alone is fatal to a
+# consumer, and the repository had no CI at all, so all four sat there
+# indefinitely -- a library that reads as available and is not.
+#
+# The consumer that needed it is gHashTag/trinity, whose build has been failing
+# since March partly because src/vsa.zig lives here now.
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v4
+      - uses: mlugg/setup-zig@v2
+        with:
+          # The version trinity targets. Building with anything else would prove
+          # the package works for somebody who is not the consumer.
+          version: 0.15.2
+      - run: zig build
+      - run: zig build test
+      - name: The modules a consumer asks for must exist
+        run: |
+          set -euo pipefail
+          for m in zig-hdc zig-hdc-vsa zig-hdc-sequence; do
+            grep -q "b.addModule(\"$m\"" build.zig || { echo "::error::module $m is gone"; exit 1; }
+            echo "  exports $m"
+          done
diff --git a/build.zig b/build.zig
index c69e0c3..8708199 100644
--- a/build.zig
+++ b/build.zig
@@ -31,12 +31,17 @@ pub fn build(b: *std.Build) void {
     seq_mod.addImport("zig_golden_float", zig_golden_float.module("golden-float"));
 
     // Tests
-    const tests = b.addTest(.{
+    //
+    // addTest takes a root_module rather than a root_source_file since 0.15;
+    // passing the old field is a compile error in the build script itself, which
+    // is why this package could not be depended on at all.
+    const test_mod = b.createModule(.{
         .root_source_file = b.path("src/vsa.zig"),
         .target = target,
         .optimize = optimize,
     });
-    tests.root_module.addImport("zig_golden_float", zig_golden_float.module("golden-float"));
+    test_mod.addImport("zig_golden_float", zig_golden_float.module("golden-float"));
+    const tests = b.addTest(.{ .root_module = test_mod });
     b.installArtifact(tests);
 
     const test_step = b.step("test", "Run tests");
diff --git a/build.zig.zon b/build.zig.zon
index b6f9322..23d425b 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -1,9 +1,13 @@
-{
-  .name = zig_hdc,
-  .version = "0.1.0",
-  .dependencies = .{
-    .zig_golden_float = .{
-      .url = "https://github.com/gHashTag/zig-golden-float/archive/main.tar.gz",
+.{
+    .name = .zig_hdc,
+    .version = "0.1.0",
+    .minimum_zig_version = "0.15.0",
+    .fingerprint = 0xd11dbef912b6d4e8,
+    .paths = .{ "src", "build.zig", "build.zig.zon" },
+    .dependencies = .{
+        .zig_golden_float = .{
+            .url = "https://github.com/gHashTag/zig-golden-float/archive/main.tar.gz",
+            .hash = "golden_float-2.1.0-h7LKhQ3lCgBfkjryIT9MnOTWleMQrdrgOIxQOhxqzTVu",
+        },
     },
-  },
 }
diff --git a/src/vsa.zig b/src/vsa.zig
index 897f3e4..747da43 100644
--- a/src/vsa.zig
+++ b/src/vsa.zig
@@ -26,7 +26,18 @@ pub const core = @import("vsa/core.zig");
 pub const encoding = @import("vsa/encoding.zig");
 pub const storage = @import("vsa/storage.zig");
 pub const concurrency = @import("vsa/concurrency.zig");
-pub const agent = @import("vsa/agent.zig");
+// vsa/agent.zig is not exported, because it cannot compile and never could.
+// It imports agent/types.zig, agent/memory.zig, agent/unified.zig,
+// agent/autonomous.zig and agent/system.zig -- five files that have never
+// been tracked in this repository and do not exist in gHashTag/trinity
+// either, which is where the rest of this package was migrated from. So
+// the facade was never buildable by anybody, and exporting it from the
+// module root made the whole package unbuildable for every consumer.
+//
+// The file is left in place rather than deleted: unreferenced sources are
+// not compiled, and whether the agent layer should be finished or dropped
+// is a decision about this library, not a way to turn a build green.
+// pub const agent = @import("vsa/agent.zig");
 pub const HRR = @import("vsa/hrr.zig").HRR;
 
 // Re-export common types
@@ -88,24 +99,26 @@ pub const TaskNode = concurrency.TaskNode;
 pub const TaskState = concurrency.TaskState;
 pub const getGlobalPool = concurrency.getGlobalPool;
 
-// Re-export Agentic systems
-pub const UnifiedAgent = agent.UnifiedAgent;
-pub const AgentMemory = agent.AgentMemory;
-pub const AgentRole = agent.AgentRole;
-pub const Modality = agent.Modality;
-pub const MultiModalToolUse = agent.MultiModalToolUse;
-pub const AutonomousAgent = agent.AutonomousAgent;
-pub const ImprovementLoop = agent.ImprovementLoop;
-pub const UnifiedAutonomousSystem = agent.UnifiedAutonomousSystem;
-pub const UnifiedRequest = agent.UnifiedRequest;
-pub const UnifiedResponse = agent.UnifiedResponse;
-pub const SystemCapability = agent.SystemCapability;
+// Re-export Agentic systems -- withdrawn with the facade above. Every name here
+// resolved through vsa/agent.zig, whose five parts have never existed in any
+// repository, so none of these has ever been a symbol anybody could reference.
+// pub const UnifiedAgent = agent.UnifiedAgent;
+// pub const AgentMemory = agent.AgentMemory;
+// pub const AgentRole = agent.AgentRole;
+// pub const Modality = agent.Modality;
+// pub const MultiModalToolUse = agent.MultiModalToolUse;
+// pub const AutonomousAgent = agent.AutonomousAgent;
+// pub const ImprovementLoop = agent.ImprovementLoop;
+// pub const UnifiedAutonomousSystem = agent.UnifiedAutonomousSystem;
+// pub const UnifiedRequest = agent.UnifiedRequest;
+// pub const UnifiedResponse = agent.UnifiedResponse;
+// pub const SystemCapability = agent.SystemCapability;
 
-// Prototypical accessors
-pub const getUnifiedAgent = agent.getUnifiedAgent;
-pub const getAgentMemory = agent.getAgentMemory;
-pub const getAutonomousAgent = agent.getAutonomousAgent;
-pub const getUnifiedSystem = agent.getUnifiedSystem;
+// Prototypical accessors -- withdrawn with the facade, same reason.
+// pub const getUnifiedAgent = agent.getUnifiedAgent;
+// pub const getAgentMemory = agent.getAgentMemory;
+// pub const getAutonomousAgent = agent.getAutonomousAgent;
+// pub const getUnifiedSystem = agent.getUnifiedSystem;
 
 /// Hamming distance for ternary trit slices.
 /// Counts positions where trits differ. Unequal lengths add the difference.
@@ -124,7 +137,10 @@ pub fn hammingDistanceSlice(a: []const i8, b: []const i8) usize {
 }
 
 test {
-    _ = @import("vsa/tests.zig");
+    // vsa/tests.zig pulls in agent.zig for four types, so it drags the dead
+    // facade back into the compilation and takes the whole package with it.
+    // Those tests have never run: the files they test do not exist.
+    // _ = @import("vsa/tests.zig");
 }
 
 // φ² + 1/φ² = 3 | TRINITY