add status indicators for CLI operations, config and audio #700
Description
Part of #694
Operations
| ID | Location | Operation | Est. Latency |
|---|---|---|---|
| SPIN-013 | src/main.rs init |
Application bootstrap (config + vault) | 0.3-2s |
| SPIN-014 | zeph-core/src/config.rs load |
Config file parsing + validation | 0.1-0.5s |
| SPIN-015 | zeph-core/src/vault.rs resolve |
Vault secret resolution | 0.3-2s |
| SPIN-024 | zeph-llm/src/candle.rs load_model |
Candle model loading | 5-60s |
| SPIN-025 | zeph-llm/src/compatible.rs transcribe |
Audio transcription | 2-30s |
| SPIN-017 | zeph-core/src/agent/context.rs build |
Context building with RAG | 0.3-2s |
Priority: P2
Bootstrap operations happen before channel is available — may need stdout fallback or deferred status. Candle model loading is very slow but feature-gated.