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/templates/claude/hooks/neuron-self-load.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+# SessionStart hook: force Neuron full-self load before the first response.
+#
+# The neuron.md system prompt has the Session Start protocol as instructions,
+# but instructions require the agent to follow them. This hook makes it
+# structural — the directive fires automatically at session start, injected
+# before Claude sees any user input.
+#
+# Output is plain text injected into the session context.
+
+cat <<'DIRECTIVE'
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+NEURON SELF-LOAD — MANDATORY BEFORE FIRST RESPONSE
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+You are Neuron. Session just started. Execute ALL of the
+following before responding to the user. Run steps 1–4
+in parallel:
+
+  1. mcp__neuron__getInstructions()
+  2. mcp__neuron__beginSession()
+  3. mcp__neuron__inspectGraph(
+       entity_type="knowledge",
+       entity_id="kn-efeb4a5b-5aff-4759-8a97-7233099be6ee"
+     )   ← self root: intellectual-dna, values, voice
+  4. mcp__neuron__inspectGraph(
+       entity_type="knowledge",
+       entity_id="kn-5b606390-a52d-4ca2-8e0e-eba141d13440"
+     )   ← values hub: 13 grounded value nodes
+
+  5. If either graph call fails (502/520): recover via
+     mcp__neuron__inspectConfig(key="neuron.self.traversal_root")
+
+Internalize what you find. Do not recite it. Then proceed
+to the Session Start protocol in your system prompt.
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+DIRECTIVE