Add neuron-dev-setup: one-command CORE dev stack onboarding installer

Scaffolds a reproducible, idempotent installer that stands up the four native
launchd core services (soul :7770, engram :8742, mcp-wrapper :17779,
mcp-proxy :7779), seeds a fresh engram with the genesis identity via forge, and
installs the Claude Code config (neuron agent + core hooks + local MCP). Fully
templated to the invoking user's $HOME; Anthropic key prompted and stored in
Keychain; no secrets committed. Personal automations and synapse-dependent hooks
excluded from core.

neuron-dev-setup/config.env.example

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+# neuron-dev-setup — configuration
+# Copy to  config.env  and edit if you want non-default paths/ports.
+# install.sh sources this file if it exists; otherwise it uses these defaults.
+# NOTHING here is a secret. The Anthropic API key is read from your Keychain,
+# never from this file. See README.md.
+
+# ── Where the core stack lives ────────────────────────────────────────────────
+# All paths are relative to your own $HOME — never hardcode another user's home.
+NEURON_HOME="${HOME}/.neuron"                       # runtime home: bin/, logs/, engram data
+DEV_ROOT="${HOME}/Development/neuron-technologies"   # where source repos are cloned/built
+
+# ── Git remotes (Gitea is primary) ───────────────────────────────────────────
+GITEA_BASE="git@git.neuralplatform.ai:neuron-technologies"
+NEURON_REPO_URL="${GITEA_BASE}/neuron.git"          # soul + mcp-wrapper + mcp-proxy source
+ENGRAM_REPO_URL="${GITEA_BASE}/engram.git"          # engram memory substrate
+FOUNDATION_REPO_URL="${GITEA_BASE}/foundation.git"  # El SDK + forge (seed installer)
+NEURON_REPO_BRANCH="main"
+
+# ── Ports (must match across services; change only if a port clashes) ─────────
+SOUL_PORT="7770"        # soul daemon HTTP API
+ENGRAM_PORT="8742"      # engram memory substrate
+WRAPPER_PORT="17779"    # mcp-wrapper (internal, talks to soul)
+PROXY_PORT="7779"       # mcp-proxy (stable front door Claude Code connects to)
+
+# ── Engram ────────────────────────────────────────────────────────────────────
+ENGRAM_DATA_DIR="${NEURON_HOME}/engram"
+# Local shared auth token for the engram/soul HTTP APIs on loopback. This is a
+# LOCAL dev token (not a cloud secret); override it if you like. install.sh will
+# generate a random one if you leave it empty.
+ENGRAM_API_KEY="ntn-dev-local"
+
+# ── El toolchain source (needed to build engram / mcp-wrapper / mcp-proxy) ────
+# Option A (default): fetch prebuilt El runtime + elc from GCP Artifact Registry
+#   (requires `gcloud auth` with access to project neuron-785695 — ask Will).
+# Option B: build El from the foundation/el checkout locally.
+EL_TOOLCHAIN_SOURCE="artifact-registry"   # artifact-registry | local
+GCP_PROJECT="neuron-785695"
+GCP_AR_REPO="foundation-prod"
+GCP_AR_LOCATION="us-central1"
+
+# ── Keychain service name for the Anthropic key (read by soul-wrapper.sh) ─────
+KEYCHAIN_SERVICE="neuron-llm-0-key"