config: drop dead code and collapse to a single backend

Config had accumulated several obsolete fields, a legacy load path
that was just returning defaults, and multi-backend infrastructure
that's no longer used.

Removed from Config (memory section):
- load_legacy_jsonl() — just returned Config::default(), no callers
- The legacy-fallback branch in load_from_file
- surface_hooks, surface_timeout_secs — zero external readers
- scoring_chunk_tokens + default fn — zero external readers
- The POC_MEMORY_CONFIG env override note in the header comment
  (not actually wired up anywhere)

Collapsed multi-backend to single-backend:
- AppConfig used to carry `anthropic: BackendConfig` and
  `openrouter: BackendConfig` as required fields plus an optional
  `deepinfra`, picked between at runtime by name. Only one is ever
  actually used in any deployment. Collapse to a single
  `backend: BackendConfig` on AppConfig, drop the multi-backend
  match logic in resolve_model, drop the top-level `backend: String`
  selector field, drop the `BackendConfig::resolve` fallback path.
- Also drop BackendConfig.model (redundant with ModelConfig.model_id
  once multi-backend is gone).
- ModelConfig.backend field goes — there's only one backend now, no
  choice to make.

Dead prompt_file machinery:
- ModelConfig.prompt_file, ResolvedModel.prompt_file, SessionConfig
  .prompt_file, Agent.prompt_file — nothing in the codebase actually
  reads the file these strings name. Just passed around and compared.
  Delete the whole string through every struct.
- The "if prompt_file changed on model switch, recompact" branch in
  user/chat.rs goes too (never fired usefully).

Dead memory_project plumbing:
- AppConfig.memory_project field, CliArgs.memory_project, the
  --memory-project CLI flag, the figment merge target, the show_config
  display line. Nothing reads it anywhere.

Dead ContextInfo struct:
- `struct ContextInfo` was never constructed — context_info: None
  was the only initializer. The conditional display blocks in
  user/context.rs that dereferenced it were dead.

Behavior change: AppConfig::resolve() now requires a non-empty
`models` map and bails with a helpful message if it's missing. The
old fallback ("no models? use top-level backend + PromptConfig to
build a default") path is gone — it was only kept for symmetry with
a mode nobody used.

Config file shape: `deepinfra: {...}` → `backend: {...}`, and
model entries no longer need `backend:` or `prompt_file:`. Updated
~/.consciousness/config.json5 to match.

Co-Authored-By: Proof of Concept <poc@bcachefs.org>

src/user/context.rs

@@ -126,14 +126,7 @@ impl ScreenView for ConsciousScreen {
         let section_style = Style::default().fg(Color::Yellow);
 
         lines.push(Line::styled("── Model ──", section_style));
-        let model_display = app.context_info.as_ref()
-            .map_or_else(|| app.status.model.clone(), |i| i.model.clone());
-        lines.push(Line::raw(format!("  Current: {}", model_display)));
-        if let Some(ref info) = app.context_info {
-            lines.push(Line::raw(format!("  Backend: {}", info.backend)));
-            lines.push(Line::raw(format!("  Prompt:  {}", info.prompt_file)));
-            lines.push(Line::raw(format!("  Available: {}", info.available_models.join(", "))));
-        }
+        lines.push(Line::raw(format!("  Current: {}", app.status.model)));
         lines.push(Line::raw(""));
 
         lines.push(Line::styled("── Context State ──", section_style));
@@ -153,8 +146,6 @@ impl ScreenView for ConsciousScreen {
 
             lines.push(Line::raw(format!("  {:53} {:>6} tokens", "────────", "──────")));
             lines.push(Line::raw(format!("  {:53} {:>6} tokens", "Total", total)));
-        } else if let Some(ref info) = app.context_info {
-            lines.push(Line::raw(format!("  Context message: {:>6} chars", info.context_message_chars)));
         }
         lines.push(Line::raw(""));