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, 1 insertions, 0 deletions

diff --git a/Omni/Bild.nix b/Omni/Bild.nix
index 6a7b87f..f6291ef 100644
--- a/Omni/Bild.nix
+++ b/Omni/Bild.nix
@@ -166,6 +166,7 @@
           ../Omni/Cli.hs
           ../Omni/Log.hs
           ../Omni/Log/Concurrent.hs
+          ../Omni/Log/Terminal.hs
           ../Omni/Namespace.hs
           ../Omni/Test.hs
         ];