feat: HTTP server for exporting Arborix bundles

Introduces a read-only HTTP server (WAI/Warp) backed by the content
store, exposing three bundle-export endpoints:

- GET /bundle/name/:name   — export by stored term name
- GET /bundle/hash/:hash   — export by full Merkle hash
- GET /terms               — plain-text listing (debug)

Also adds `tricu server` (aka `--serve`) CLI mode, move `resolveExportTarget` /
 `namesForHash` / `looksLikeHash` out of `Main.hs` into `ContentStore.hs`,
and cleans up unused exports and imports across `FileEval.hs` and `Wire.hs`.

src/FileEval.hs

@@ -3,7 +3,6 @@ module FileEval
   , evaluateFile
   , evaluateFileWithContext
   , evaluateFileResult
-  , evaluateFile
   , compileFile
   ) where
 
@@ -19,9 +18,8 @@ import Data.List       (partition)
 import Data.Maybe      (fromMaybe, mapMaybe)
 import System.Environment (setEnv)
 import System.FilePath (takeDirectory, normalise, (</>))
-import System.IO (hPutStrLn, stderr)
 import System.Exit (die)
-import Database.SQLite.Simple (Connection, close)
+import Database.SQLite.Simple (close)
 
 import qualified Data.ByteString.Lazy as BL
 import qualified Data.Map as Map
@@ -110,9 +108,6 @@ makeRelativeTo f i =
     let d = takeDirectory f
     in normalise $ d </> i
 
-nsDefinitions :: String -> [TricuAST] -> [TricuAST]
-nsDefinitions moduleName = map (nsDefinition moduleName)
-
 nsDefinition :: String -> TricuAST -> TricuAST
 nsDefinition "" def = def
 nsDefinition moduleName (SDef name args body)