agent: lumotia-rebrand — rust workspace crates magnotia-* -> lumotia-*

Phase 2 of the rebrand cascade. Renames all 9 workspace crates from
magnotia-* to lumotia-* plus the src-tauri binary crate name:

- magnotia-ai-formatting   -> lumotia-ai-formatting
- magnotia-audio           -> lumotia-audio
- magnotia-cloud-providers -> lumotia-cloud-providers
- magnotia-core            -> lumotia-core
- magnotia-hotkey          -> lumotia-hotkey
- magnotia-llm             -> lumotia-llm
- magnotia-mcp             -> lumotia-mcp
- magnotia-storage         -> lumotia-storage
- magnotia-transcription   -> lumotia-transcription
- magnotia                 -> lumotia (src-tauri binary)
- magnotia_lib             -> lumotia_lib (src-tauri lib target)

Crate directories (crates/audio/ etc.) stay as-is; only the Cargo.toml
[package] name field changes plus all consumer module imports
(magnotia_core -> lumotia_core, etc.).

Remaining magnotia_* references at this point are intentional and
scoped to later phases: tracing targets (Phase 4), DB setting keys
magnotia_preferences/magnotia_history (Phase 5).

cargo build --workspace passes. cargo test --workspace: 330 pass, 0 fail.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/transcription/src/local_engine.rs

@@ -4,8 +4,8 @@ use std::time::Instant;
 
 use transcribe_rs::{SpeechModel, TranscribeOptions, TranscriptionResult};
 
-use magnotia_core::error::{MagnotiaError, Result};
-use magnotia_core::types::{
+use lumotia_core::error::{MagnotiaError, Result};
+use lumotia_core::types::{
     AudioSamples, EngineName, ModelId, Segment, Transcript, TranscriptionOptions,
 };
 
@@ -28,7 +28,7 @@ pub struct SpeechModelAdapter(pub Box<dyn SpeechModel + Send>);
 impl Transcriber for SpeechModelAdapter {
     fn capabilities(&self) -> TranscriberCapabilities {
         TranscriberCapabilities {
-            sample_rate: magnotia_core::constants::WHISPER_SAMPLE_RATE,
+            sample_rate: lumotia_core::constants::WHISPER_SAMPLE_RATE,
             channels: 1,
             supports_initial_prompt: false,
         }