spike(taxonome): standalone structured taxonomy evaluation with Ax and Copilot SDK

AGENTS.md

@@ -266,6 +266,7 @@ not open the PR against the fork unless the user explicitly asks you to.
 | [docs/architecture/app-design.md](docs/architecture/app-design.md) | Data models, API design, package dependency graph |
 | [docs/architecture/experiments.md](docs/architecture/experiments.md) | Canonical Experiment revisions, execution attempts, fixed-vector storage, publication, and client contract |
 | [docs/architecture/prompt-evaluations.md](docs/architecture/prompt-evaluations.md) | Static prompt quality, datasets, commands, and maintenance rules |
+| [docs/architecture/taxonome.md](docs/architecture/taxonome.md) | Standalone two-element Taxonome spike, ATIF/JSON API, evals and replay |
 | [docs/architecture/data-organization-projects.md](docs/architecture/data-organization-projects.md) | Projects (a single container) to isolate/group data within a cluster; composes with data-tags and auth-rbac |
 | [docs/architecture/auth-rbac.md](docs/architecture/auth-rbac.md) | Explicit-login IdP auth, Redis user-access cache, Portal handshake; deferred RBAC/internal-token roadmap |
 | [docs/architecture/vscode-web-worker.md](docs/architecture/vscode-web-worker.md) | XState chat machine, GitHub auth flow, ARIA snapshots |

apps/taxonome/README.md

@@ -0,0 +1,21 @@
+# Taxonome
+
+Standalone experimental YAML taxonomy CLI for plain ATIF and existing Scope run
+archives. The initial taxonomy evaluates Skipped Invocation through Ax and the
+Copilot SDK, and Timeout through deterministic TypeScript. Explicit local or
+installed-package plugins can add custom deterministic handlers without
+modifying Taxonome. No Scope backing services are needed.
+
+The generic runtime is `packages/taxonomy-engine`; the shipped
+agent-behavior definitions and Timeout handler are isolated in
+`packages/ax-taxonomy`. The CLI explicitly composes both packages.
+
+See [the architecture and usage guide](../../docs/architecture/taxonome.md)
+for YAML and `extra.scope` contracts, archive safety, plugin authoring,
+build/run/eval/optimization/replay commands, the typed API, evidence policy,
+and scope limitations. A runnable custom project lives in
+[`examples/taxonome-custom-handler`](../../examples/taxonome-custom-handler/README.md).
+
+The [recorded findings](../../docs/architecture/taxonome.md#recorded-spike-findings-2026-10-21)
+link the actual SDK baselines, complete Ax artifacts, fresh final comparisons,
+cumulative 256/500-call ledger, and deterministic JSON/Markdown preview.

apps/taxonome/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "taxonome",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "bin": { "taxonome": "dist/index.js" },
+  "scripts": { "build": "tsc", "lint": "tsc --noEmit" },
+  "dependencies": {
+    "ax-taxonomy": "workspace:*",
+    "taxonomy-engine": "workspace:*",
+    "commander": "14.0.3"
+  },
+  "devDependencies": { "@types/node": "^22.7.0", "typescript": "^5.6.2" }
+}