chore(gate): drive the dead-export guard with knip, drop ts-prune

ts-prune has been unmaintained since 2022 and pulls ts-morph@13 plus a
hand-rolled output parser that false-positived on satisfies/boolean/
Record narrowing and could not resolve path-alias fan-in. The guard
unions knip's default scan with a production agent-workspace scan
(knip.agents.json; --production ignores test-file consumers so the
director surface stays enforced); parsing is fail-closed and config
carries no spawn args, so the tsPruneArgs race is gone.

Allowlist semantics are unchanged. Entries go 70 to 83: 42 superseded
ts-prune artifacts removed; tax entries added for 22 consumer-less
exports plus 4 unreachable files (owner-reason blocks, pending cleanup
lanes) and the 29 director-surface names consumed only by workspace
package tests. Deleting them belongs to the cleanup lanes.

Author: TheGreatAxios

bun.lock

@@ -0,0 +1,39 @@
+{
+  "$schema": "https://unpkg.com/knip@6/schema.json",
+  "entry": [
+    "src/index.ts",
+    "src/tui/smoke.ts",
+    "scripts/*.ts",
+    "e2e/*.test.ts",
+    "evals/*.ts"
+  ],
+  "project": [
+    "src/**/*.ts",
+    "testkit/**/*.ts",
+    "packages/**/*.ts",
+    "e2e/**/*.ts",
+    "evals/**/*.ts",
+    "scripts/**/*.ts",
+    "agents/**/*.ts",
+    "vendor/**/*.ts"
+  ],
+  "workspaces": {
+    "agents/*": {
+      "entry": ["src/index.ts!"],
+      "project": ["src/**/*.ts!"]
+    }
+  },
+  "includeEntryExports": true,
+  "rules": {
+    "exports": "error",
+    "types": "error",
+    "files": "error",
+    "enumMembers": "error",
+    "namespaceMembers": "error",
+    "nsExports": "off",
+    "nsTypes": "off",
+    "duplicates": "off",
+    "cycles": "off"
+  },
+  "ignoreExportsUsedInFile": true
+}

knip.agents.json

@@ -0,0 +1,33 @@
+{
+  "$schema": "https://unpkg.com/knip@6/schema.json",
+  "entry": [
+    "src/index.ts",
+    "src/tui/smoke.ts",
+    "scripts/*.ts",
+    "e2e/*.test.ts",
+    "evals/*.ts"
+  ],
+  "project": [
+    "src/**/*.ts",
+    "testkit/**/*.ts",
+    "packages/**/*.ts",
+    "e2e/**/*.ts",
+    "evals/**/*.ts",
+    "scripts/**/*.ts",
+    "agents/**/*.ts",
+    "vendor/**/*.ts"
+  ],
+  "includeEntryExports": true,
+  "rules": {
+    "exports": "error",
+    "types": "error",
+    "files": "error",
+    "enumMembers": "error",
+    "namespaceMembers": "error",
+    "nsExports": "off",
+    "nsTypes": "off",
+    "duplicates": "off",
+    "cycles": "off"
+  },
+  "ignoreExportsUsedInFile": true
+}

knip.json

@@ -118,9 +118,9 @@
   "devDependencies": {
     "@intx/inference-testing": "0.3.0",
     "@types/bun": "1.4.3",
+    "knip": "^6.41.0",
     "oxfmt": "^0.73.0",
     "oxlint": "^1.88.0",
-    "ts-prune": "0.10.3",
     "typescript": "5.9.3",
     "typescript-language-server": "^4.3.4",
     "ws": "^8.21.0"