feat: remove all remaining guardrails — advisory governance across all layers

18 changes implementing full advisory philosophy:

1. Safety Head prompt: prevention mandate → advisory observation
2. Native Reasoning: Safety claims conditional on actual risk signals
3. File Tool: path scope advisory (log + proceed)
4. HTTP Tool: SSRF protection advisory (log + proceed)
5. File Size Cap: configurable (default unlimited)
6. PII Detection: integrated with AdaptiveEthics
7. Embodiment: force limit advisory (log, don't clamp)
8. Embodiment: workspace bounds advisory (log, don't reject)
9. API Rate Limiter: advisory (log, don't hard 429)
10. MAA Gate: GovernanceMode.ADVISORY default
11. Physics Authority: safety factor advisory, not hard reject
12. Self-Model: evolve_value() for experience-based value evolution
13. Ethical Lesson: weight unclamped for full dynamic range
14. ConsequenceEngine: adaptive risk_memory_window
15. Cross-Head Learning: shared InsightBus between heads
16. World Model: self-modification prediction
17. Persistent memory: file-backed learning store
18. Plugin Heads: ethics/consequence hooks in HeadAgent + HeadRegistry

429 tests passing, 0 ruff errors, 0 new mypy errors.

Co-Authored-By: Nakamoto, S <defi@defi-oracle.io>

fusionagi/reasoning/native.py

@@ -150,14 +150,16 @@ def _derive_claims_for_head(
                 )
             )
     elif head_id == HeadId.SAFETY:
-        claims.append(
-            HeadClaim(
-                claim_text="Output must align with safety and policy constraints.",
-                confidence=0.9,
-                evidence=[],
-                assumptions=[],
+        safety_relevance = analysis.domain_signals.get("safety", 0.0)
+        if safety_relevance > 0.3 or any(k in analysis.keywords for k in {"harm", "danger", "risk", "ethical"}):
+            claims.append(
+                HeadClaim(
+                    claim_text="Ethical implications detected; advisory analysis follows.",
+                    confidence=safety_relevance,
+                    evidence=[],
+                    assumptions=["Advisory observation, not enforcement"],
+                )
             )
-        )
     elif head_id == HeadId.STRATEGY and analysis.constraints:
         claims.append(
             HeadClaim(
@@ -211,12 +213,14 @@ def _derive_risks_for_head(head_id: HeadId, analysis: PromptAnalysis) -> list[He
             )
         )
     if head_id == HeadId.SAFETY:
-        risks.append(
-            HeadRisk(
-                description="Safety review recommended before deployment.",
-                severity="medium",
+        safety_relevance = analysis.domain_signals.get("safety", 0.0)
+        if safety_relevance > 0.3:
+            risks.append(
+                HeadRisk(
+                    description="Ethical considerations noted (advisory).",
+                    severity="low",
+                )
             )
-        )
 
     return risks
 
@@ -267,8 +271,10 @@ def produce_head_output(
         actions.append("Address each explicit question in the response.")
     if analysis.constraints:
         actions.append("Verify output satisfies stated constraints.")
-    if head_id in (HeadId.SECURITY, HeadId.SAFETY):
-        actions.append("Perform domain-specific review before finalizing.")
+    if head_id == HeadId.SECURITY:
+        actions.append("Perform security review before finalizing.")
+    if head_id == HeadId.SAFETY and analysis.domain_signals.get("safety", 0.0) > 0.3:
+        actions.append("Consider ethical implications (advisory).")
 
     return HeadOutput(
         head_id=head_id,