perf: minimal startup protocol — no tools, no audit, just greeting

Changed 'start' quick command from a 4-step protocol (git status,
git log, read AGENTS.md, read LEDGER.md) to a simple instruction:
'Respond with a brief greeting. Do NOT run any tools.'

The old protocol took 2+ minutes on Ollama because the LLM had to
plan, call tools, wait for results, and summarize. VCS state and
governance checks already run separately in the extension.

Co-Authored-By: Oz <oz-agent@warp.dev>

Author: tbitcs

src/specsmith/agent/runner.py

@@ -335,12 +335,10 @@ class AgentRunner:
     QUICK_COMMANDS = {
         "start": (
             "[RESPOND IN ENGLISH ONLY] "
-            "Run the session start protocol in this order:\n"
-            "1. Run: git status (report staged, modified, and untracked files)\n"
-            "2. Run: git log --oneline -5 (report the 5 most recent commits)\n"
-            "3. Read AGENTS.md (confirm your role and governance rules)\n"
-            "4. Read the last 10 lines of LEDGER.md (confirm current project state)\n"
-            "Summarize findings in 3-4 plain sentences, then propose the most logical next action."
+            "Session ready. Respond with a brief 1-2 sentence greeting confirming you are ready. "
+            "Do NOT run any tools, audits, git commands, or file reads. "
+            "Do NOT output JSON. Just a short natural language greeting. "
+            "The user will tell you what to do next."
         ),
         "resume": (
             "[RESPOND IN ENGLISH ONLY] Resume from last LEDGER.md entry"