feat(validator): add bare FastAgent + Pallas validator for Mnemosyne MCP

A self-contained sub-project under validator/ that wraps Mnemosyne's MCP
server in a single FastAgent. Use it to confirm — outside of Daedalus —
that Mnemosyne's MCP transport works, every tool registers, args/responses
round-trip, and an LLM can actually drive the tools.

The validator is its own Pallas-consuming project with its own pyproject
(pallas-mcp + fast-agent-mcp), agents.yaml, and fastagent.config.yaml —
matching the pattern used by Iolaus and other Pallas consumers. It does
not import Mnemosyne Python code; it only speaks MCP over HTTP.

The agent never sets workspace_id, so all calls run against the global
scope (libraries with workspace_id IS NULL). Workspace-scoped validation
will come once Daedalus's chat path is wired (Daedalus injects
workspace_id server-side, force-overwriting whatever the LLM produces).

Default model is openai.Qwen3.5-35B-A3B-UD-Q4_K_XL.gguf served by
llama.cpp at nyx.helu.ca:22079/v1. Token provisioning via
`python manage.py create_mcp_token --user <u> --name validator`.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

validator/pyproject.toml

@@ -0,0 +1,23 @@
+[project]
+name = "mnemosyne-validator"
+version = "0.1.0"
+description = "FastAgent + Pallas validator that talks to Mnemosyne's MCP server end-to-end"
+requires-python = ">=3.13"
+dependencies = [
+    "pallas-mcp @ git+ssh://git@git.helu.ca:22022/r/pallas.git",
+    "fast-agent-mcp>=0.6.10",
+    "pyyaml>=6.0",
+]
+
+[project.scripts]
+mnemosyne-validator = "pallas.server:main"
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.metadata]
+allow-direct-references = true
+
+[tool.hatch.build.targets.wheel]
+packages = ["agents"]