agent: lumotia-rebrand — fix QC blockers for phase 2

Phase 2 QC found three explicit blockers + a broader sweep needed:

Explicit (QC-named):
- crates/mcp/src/lib.rs:15 — SERVER_NAME public MCP wire identity
- crates/transcription/build.rs:59 — panic message prefix
- crates/llm/tests/content_tags_smoke.rs:7 — docstring -p flag

Swept (string literals + dev env vars + doc comments + test fixtures):
- crates/mcp/src/main.rs — eprintln log prefixes
- src-tauri/src/commands/diagnostics.rs — diagnostic filename + MAGNOTIA_VERSION
- src-tauri/src/commands/audio.rs — recording filename pattern lumotia-<secs>-...wav
- src-tauri/src/commands/fs.rs — test placeholder path
- crates/transcription/src/model_manager.rs — .lumotia-verified marker
- crates/storage/src/database.rs — lumotia-storage-ro-<pid> temp dirs + doc comments
- crates/cloud-providers/src/keystore.rs — LUMOTIA_API_KEY_<PROVIDER> env var
- crates/audio/src/{wav,decode}.rs — lumotia_test_* / lumotia_decode_* test fixtures
- crates/core/src/tuning.rs — LUMOTIA_INFERENCE_THREADS env var
- All MAGNOTIA_LLM_TEST_MODEL / MAGNOTIA_WHISPER_TEST_* env vars
- Doc comments referencing crate names

Excluded (intentional Phase 4/5 scope):
- magnotia_preferences, magnotia_history, magnotia_morning_triage_last_shown
  DB setting keys (Phase 5 paths.rs migration)
- magnotia_startup tracing target (Phase 4)
- crates/core/src/paths.rs (Phase 5 wholesale rewrite + migration shim)

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

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

src-tauri/src/commands/audio.rs

@@ -52,8 +52,8 @@ pub fn resolve_recording_path(
 ///   collisions, which `SystemTime::now()` alone cannot guarantee
 ///   (two calls in the same clock tick can return identical nanos).
 ///
-/// Format: `magnotia-<secs>-<nanos_in_sec>-<counter>.wav`, e.g.
-/// `magnotia-1776828000-123456789-0000.wav`.
+/// Format: `lumotia-<secs>-<nanos_in_sec>-<counter>.wav`, e.g.
+/// `lumotia-1776828000-123456789-0000.wav`.
 fn recording_filename() -> String {
     let duration = std::time::SystemTime::now()
         .duration_since(std::time::UNIX_EPOCH)
@@ -61,7 +61,7 @@ fn recording_filename() -> String {
     let secs = duration.as_secs();
     let nanos = duration.subsec_nanos();
     let counter = RECORDING_COUNTER.fetch_add(1, Ordering::SeqCst);
-    format!("magnotia-{secs}-{nanos:09}-{counter:04}.wav")
+    format!("lumotia-{secs}-{nanos:09}-{counter:04}.wav")
 }
 
 /// Process-lifetime monotonic counter for `recording_filename`. Starts
@@ -97,11 +97,11 @@ mod tests {
     #[test]
     fn recording_filename_has_expected_shape() {
         let name = recording_filename();
-        assert!(name.starts_with("magnotia-"));
+        assert!(name.starts_with("lumotia-"));
         assert!(name.ends_with(".wav"));
-        // Shape: magnotia-<digits>-<9 digits>-<>=4 digits>.wav
+        // Shape: lumotia-<digits>-<9 digits>-<>=4 digits>.wav
         let rest = name
-            .strip_prefix("magnotia-")
+            .strip_prefix("lumotia-")
             .and_then(|s| s.strip_suffix(".wav"))
             .expect("shape prefix/suffix");
         let parts: Vec<&str> = rest.split('-').collect();