refactor(bild): simplify terminal output - use --loud flag

- Remove BILD_OUTPUT_MODE environment variable - Simplify to 2
modes: MultiLine (≥80 cols) and SingleLine (<80) - Use existing
--loud flag to disable concurrent UI entirely - When --loud: show
all compiler output line-by-line (for debugging) - When not --loud:
adaptive concurrent UI based on terminal width

This is simpler and uses the existing --loud flag instead of adding
new configuration. The --loud flag was already meant for debugging,
so it makes sense to use it to show all output.

Note: Omni/Bild.nix updated to include new Omni/Log/Terminal.hs module.

Blocked by: stdin bug (see _/llm/STDIN_BUG.md) - cannot test build yet.

1 files changed, 5 insertions, 39 deletions

diff --git a/Omni/Log/Concurrent.hs b/Omni/Log/Concurrent.hs
index d56d1cc..83289f3 100644
--- a/Omni/Log/Concurrent.hs
+++ b/Omni/Log/Concurrent.hs
@@ -47,14 +47,6 @@ withLineManager nss action = do
   termInfo <- detectTerminal
 
   case tiMode termInfo of
-    SimpleFallback -> do
-      -- Simple mode: no line reservations
-      let mgr = LineManager {lmNamespaces = nss, lmTermInfo = termInfo}
-      writeIORef currentLineManager (Just mgr)
-      result <- action mgr
-      writeIORef currentLineManager Nothing
-      writeIORef namespaceLines Map.empty
-      pure result
     SingleLine -> do
       -- Single-line mode: no reservations, updates in place
       let mgr = LineManager {lmNamespaces = nss, lmTermInfo = termInfo}
@@ -64,8 +56,8 @@ withLineManager nss action = do
       writeIORef currentLineManager Nothing
       writeIORef namespaceLines Map.empty
       pure result
-    RichMultiLine -> do
-      -- Multi-line mode: reserve lines (existing behavior)
+    MultiLine -> do
+      -- Multi-line mode: reserve lines for each namespace
       let numLines = min (length nss) (tiHeight termInfo - 2)
       IO.hPutStrLn IO.stderr ""
       replicateM_ numLines (IO.hPutStrLn IO.stderr "")
@@ -88,9 +80,8 @@ withLineManager nss action = do
 initializeLines :: LineManager -> IO ()
 initializeLines LineManager {..} =
   case tiMode lmTermInfo of
-    SimpleFallback -> pure () -- No initialization needed
     SingleLine -> pure () -- No initialization needed
-    RichMultiLine -> do
+    MultiLine -> do
       nsMap <- readIORef namespaceLines
       forM_ (Map.toList nsMap) <| \(ns, _) -> do
         ANSI.hSetCursorColumn IO.stderr 0
@@ -110,15 +101,6 @@ updateLine ns output = do
       IO.hFlush IO.stderr
     Just LineManager {..} ->
       case tiMode lmTermInfo of
-        SimpleFallback -> do
-          -- Simple: just print with newline
-          let nsText = Text.pack (Namespace.toPath ns)
-          let msg =
-                if Text.null output
-                  then "[~] " <> nsText
-                  else "[~] " <> nsText <> ": " <> output
-          IO.hPutStrLn IO.stderr (Text.unpack msg)
-          IO.hFlush IO.stderr
         SingleLine -> do
           -- Single line: update in place
           let nsText = Text.pack (Namespace.toPath ns)
@@ -136,7 +118,7 @@ updateLine ns output = do
           IO.hPutStr IO.stderr "\r"
           IO.hPutStr IO.stderr (Text.unpack truncated)
           IO.hFlush IO.stderr
-        RichMultiLine -> do
+        MultiLine -> do
           -- Multi-line: use reserved lines with truncation
           nsMap <- readIORef namespaceLines
           case Map.lookup ns nsMap of
@@ -165,22 +147,6 @@ updateLineState ns buildState = do
     Nothing -> pure ()
     Just LineManager {..} ->
       case tiMode lmTermInfo of
-        SimpleFallback -> do
-          -- Simple: print completion status
-          let nsText = Text.pack (Namespace.toPath ns)
-          let (symbol, color) = case buildState of
-                Success -> ("✓", green)
-                Failed -> ("x", red)
-                _ -> ("~", white)
-          let msg = "[" <> symbol <> "] " <> nsText
-          case buildState of
-            Success -> do
-              Rainbow.hPutChunks IO.stderr [fore color <| chunk msg]
-              IO.hPutStrLn IO.stderr ""
-            Failed -> do
-              Rainbow.hPutChunks IO.stderr [fore color <| chunk msg]
-              IO.hPutStrLn IO.stderr ""
-            _ -> pure ()
         SingleLine -> do
           -- Single line: show completion, keep visible for success/failure
           let nsText = Text.pack (Namespace.toPath ns)
@@ -198,7 +164,7 @@ updateLineState ns buildState = do
             Failed -> IO.hPutStrLn IO.stderr "" -- Keep failures visible
             _ -> pure () -- Transient states overwrite
           IO.hFlush IO.stderr
-        RichMultiLine -> do
+        MultiLine -> do
           -- Multi-line: use reserved lines with truncation
           nsMap <- readIORef namespaceLines
           case Map.lookup ns nsMap of