feat(mosaic): WI-2 mutator-class guard for directive-freshness (#837)

WI-2: mutator-class guard for the compaction directive-freshness mechanism — command-position parser (prefix x var-indirection unified) + primitive-anchored invariant backstop + all-tools-hook fail-close. Parser-complete on principle: realistic evasion matrix RED-regression-covered, residual exotic evasions proven backstop-caught (B-tests), lens-convergence reached.

closes #829

packages/mosaic/framework/tools/qa/qa-hook-handler.sh

@@ -190,7 +190,7 @@ Pending QA validation
 This report was created by the QA automation hook.
 To process this report, run:
 \`\`\`bash
-claude -p "Use Task tool to launch universal-qa-agent for report: $REPORT_PATH"
+python3 ~/.config/mosaic/tools/lease-broker/launch-runtime.py --runtime claude -- claude -p "Use Task tool to launch universal-qa-agent for report: $REPORT_PATH"
 \`\`\`
 EOF
 

packages/mosaic/framework/tools/qa/remediation-hook-handler.sh

@@ -58,8 +58,8 @@ ACTIONS_PATH="$IN_PROGRESS_DIR/$ACTIONS_FILE"
 
 echo "[$(date '+%Y-%m-%d %H:%M:%S')] Starting remediation: $ACTIONS_PATH" | tee -a "$LOG_FILE"
 
-# Trigger remediation agent
-claude -p "Use Task tool to launch auto-remediation-agent for:
+# Trigger remediation agent through the authenticated lease-broker choke-point.
+python3 "$(dirname "$0")/../lease-broker/launch-runtime.py" --runtime claude -- claude -p "Use Task tool to launch auto-remediation-agent for:
 - Remediation Report: $IN_PROGRESS_DIR/$(basename "$REPORT_FILE")
 - Actions File: $ACTIONS_PATH
 - Max Iterations: 5