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, 15 insertions, 7 deletions

diff --git a/Omni/Bild.hs b/Omni/Bild.hs
index 15e359f..4bb62a5 100644
--- a/Omni/Bild.hs
+++ b/Omni/Bild.hs
@@ -555,11 +555,11 @@ analyzeAll :: [Namespace] -> IO Analysis
 analyzeAll nss = do
   LogC.withLineManager nss <| \lineMgr -> do
     LogC.initializeLines lineMgr
-    targets <- mapConcurrentlyBounded 8 (analyzeOne lineMgr) nss
+    targets <- mapConcurrentlyBounded 8 analyzeOne nss
     pure <| Map.fromList <| catMaybes <| zipWith (\ns mt -> (ns,) </ mt) nss targets
   where
-    analyzeOne :: LogC.LineManager -> Namespace -> IO (Maybe Target)
-    analyzeOne _lineMgr namespace@(Namespace parts ext) = do
+    analyzeOne :: Namespace -> IO (Maybe Target)
+    analyzeOne namespace@(Namespace parts ext) = do
       let path = Namespace.toPath namespace
       root <- Env.getEnv "CODEROOT"
       let abspath = root </> path
@@ -1147,10 +1147,18 @@ build andTest loud jobs cpus analysis = do
   root <- Env.getEnv "CODEROOT"
   let targets = Map.elems analysis
   let namespaces = map (\Target {..} -> namespace) targets
-  LogC.withLineManager namespaces <| \lineMgr -> do
-    LogC.initializeLines lineMgr
-    results <- mapConcurrentlyBounded jobs (buildTarget root) targets
-    pure (map fst results)
+  -- Use adaptive concurrent UI unless --loud is set
+  if loud
+    then do
+      -- Loud mode: simple output, no concurrent UI
+      results <- mapConcurrentlyBounded jobs (buildTarget root) targets
+      pure (map fst results)
+    else -- Adaptive UI based on terminal width
+
+      LogC.withLineManager namespaces <| \lineMgr -> do
+        LogC.initializeLines lineMgr
+        results <- mapConcurrentlyBounded jobs (buildTarget root) targets
+        pure (map fst results)
   where
     buildTarget :: FilePath -> Target -> IO (Exit.ExitCode, ByteString)
     buildTarget root target@Target {..} = do