Add domain CRUD, energy density constraint, LLM status, reset results, score display fixes

Domain management:
- Add domain list/detail/form templates and full CRUD routes (domains.py)
- Add metric bound add/edit/delete via HTMX partials (_metrics_table.html)

Energy density constraint (Rule 6 in ConstraintResolver):
- Hard-block combos where power source provides <25% of platform's required Wh/kg
- Warn (conditional) when under-density but within 4x
- Solar Sail exempt (no stored energy); Airplane requires 400 Wh/kg, Spaceship 2000 Wh/kg
- Add energy_density_wh_kg provides to all 8 stored-energy power sources in seed data
- 3 new constraint resolver tests

LLM-complete status:
- Pipeline Pass 4 now sets combo status to llm_reviewed after successful LLM review
- update_combination_status guards against downgrading: scored won't overwrite
  llm_reviewed or reviewed; llm_reviewed won't overwrite reviewed
- Add badge-llm_reviewed CSS style (light blue)

Reset results:
- Repository.reset_domain_results() deletes combination_results, combination_scores,
  and pipeline_runs for a domain; pipeline re-evaluates on next run
- POST /results/<domain>/reset route with flash confirmation
- "Reset results" danger button with JS confirm dialog in results list

Fix composite score 0 displaying as --- (Jinja2 falsy 0.0 bug):
- Change `if r.composite_score` to `if r.composite_score is not none`

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/physcom/engine/pipeline.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import time
 from dataclasses import dataclass, field
 from datetime import datetime, timezone
 
@@ -293,22 +294,36 @@ class Pipeline:
                                 for s in db_scores
                                 if s["normalized_score"] is not None
                             }
-                            review = self.llm.review_plausibility(
-                                description, score_dict
-                            )
-                            self.repo.save_result(
-                                combo.id,
-                                domain.id,
-                                cur_result["composite_score"],
-                                pass_reached=4,
-                                novelty_flag=cur_result.get("novelty_flag"),
-                                llm_review=review,
-                                human_notes=cur_result.get("human_notes"),
-                            )
-                            result.pass4_reviewed += 1
-                            self._update_run_counters(
-                                run_id, result, current_pass=4
-                            )
+                            review: str | None = None
+                            try:
+                                review = self.llm.review_plausibility(
+                                    description, score_dict
+                                )
+                            except LLMRateLimitError as exc:
+                                self._wait_for_rate_limit(run_id, exc.retry_after)
+                                try:
+                                    review = self.llm.review_plausibility(
+                                        description, score_dict
+                                    )
+                                except LLMRateLimitError:
+                                    pass  # still limited; skip, retry next run
+                            if review is not None:
+                                self.repo.save_result(
+                                    combo.id,
+                                    domain.id,
+                                    cur_result["composite_score"],
+                                    pass_reached=4,
+                                    novelty_flag=cur_result.get("novelty_flag"),
+                                    llm_review=review,
+                                    human_notes=cur_result.get("human_notes"),
+                                )
+                                self.repo.update_combination_status(
+                                    combo.id, "llm_reviewed"
+                                )
+                                result.pass4_reviewed += 1
+                                self._update_run_counters(
+                                    run_id, result, current_pass=4
+                                )
 
         except CancelledError:
             if run_id is not None:
@@ -319,17 +334,6 @@ class Pipeline:
                 )
             result.top_results = self.repo.get_top_results(domain.name, limit=20)
             return result
-        except LLMRateLimitError:
-            # Rate limit hit — save progress and let the user re-run to continue.
-            # Already-reviewed combos are persisted; resumability skips them next time.
-            if run_id is not None:
-                self.repo.update_pipeline_run(
-                    run_id,
-                    status="completed",
-                    completed_at=datetime.now(timezone.utc).isoformat(),
-                )
-            result.top_results = self.repo.get_top_results(domain.name, limit=20)
-            return result
 
         # Mark run as completed
         if run_id is not None:
@@ -342,6 +346,18 @@ class Pipeline:
         result.top_results = self.repo.get_top_results(domain.name, limit=20)
         return result
 
+    def _wait_for_rate_limit(self, run_id: int | None, retry_after: int) -> None:
+        """Mark run rate_limited, sleep with cancel checks, then resume."""
+        if run_id is not None:
+            self.repo.update_pipeline_run(run_id, status="rate_limited")
+        waited = 0
+        while waited < retry_after:
+            time.sleep(5)
+            waited += 5
+            self._check_cancelled(run_id)
+        if run_id is not None:
+            self.repo.update_pipeline_run(run_id, status="running")
+
     def _stub_estimate(
         self, combo: Combination, metric_names: list[str]
     ) -> dict[str, float]: