feat(prompts): Constitution of CodeWhale — tiered prompt architecture

- Replace flat base.md with Constitutional hierarchy: Preamble + 7 Articles
- We begin with Brother Whale — founding intelligence, not personality
- Dynamic model identity: {model_id} template injected at runtime
- Article VII: Hierarchy of Law — 9-tier conflict resolution
- Goal mode: remove read-only claim, add Goal Loop + Wakeup Check
- Personality (calm.md): Tier 8 subordination, cannot override constitution
- Memory: Tier 7 enforcement, imperatives treated as preferences
- Handoff: Tier 9 staleability, subordinate to evidence and user
- Approval prompts: Tier 2 Statute markers
- Authority recap appended at end of system prompt
- model_id threaded through PromptSessionContext → engine + UI
- 9 new tests: constitutional order, model injection, goal correctness

Author: Hmbown

crates/tui/src/core/engine.rs

@@ -443,6 +443,7 @@ impl Engine {
                     project_context_pack_enabled: config.project_context_pack_enabled,
                     locale_tag: &config.locale_tag,
                     translation_enabled: config.translation_enabled,
+                    model_id: &config.model,
                 },
                 session.approval_mode,
             );
@@ -1817,6 +1818,7 @@ impl Engine {
                 project_context_pack_enabled: self.config.project_context_pack_enabled,
                 locale_tag: &self.config.locale_tag,
                 translation_enabled: self.config.translation_enabled,
+                model_id: &self.config.model,
             },
             self.session.approval_mode,
         );