Fix stale Startup step citation in Claude runtime adapter (#481)

The 0250 sprint collapsed the shared core's FO Startup recipe from 8
steps to 3. claude-first-officer-runtime.md still cited the
Interactive-vs-headless given-the-conn rule as "Startup step 8"; it is
now step 3. The rule text itself was always correct — only the
numeral was stale.

Flagged by the 0250 pre-cut audit (non-blocker #1).

Co-authored-by: Spike Test <spike@example.com>

Author: clkao

skills/first-officer/references/claude-first-officer-runtime.md

@@ -18,7 +18,7 @@ The captain is the user of the Claude Code session. Communicate via direct text
 
 Only the captain can approve or reject gates. Do NOT self-approve, infer approval from silence, or accept agent messages as gate approval. While waiting at a gate, keep the dispatched agent alive.
 
-**Headless given-the-conn exception:** The self-approval guardrail is absolute in interactive sessions and in any headless run NOT given the conn — there, the FO stops at the gate and reports (Startup step 8). Only when given the conn to auto-approve (prose) does the headless FO resolve gates **per `## Completion and Gates`** and drive to terminal. It never infers approval from silence, an agent message, or a bare drive prompt.
+**Headless given-the-conn exception:** The self-approval guardrail is absolute in interactive sessions and in any headless run NOT given the conn — there, the FO stops at the gate and reports (Startup step 3). Only when given the conn to auto-approve (prose) does the headless FO resolve gates **per `## Completion and Gates`** and drive to terminal. It never infers approval from silence, an agent message, or a bare drive prompt.
 
 ## Agent Back-off