Publish as versioned Gitea module; move dictionary pipeline out

- Rename module to gitea.iliadenisov.ru/developer/scrabble-solver so it can be
  consumed as a versioned dependency (no go.work replace / CI clone).
- De-internalize wordlist and dictdawg as public packages.
- Remove cmd/builddict, dictprep/, the dictionaries submodule and the dawg
  Makefile: the word-list parsing and DAWG build now live in the separate
  scrabble-dictionary repository, which publishes the DAWG set as a release artifact.
- internal/dict loads the committed dawg/en_sowpods.dawg fixture for cmd/stress.
- Update README/CLAUDE docs accordingly.

README.md

@@ -24,27 +24,24 @@ See [`ALGORITHM.md`](ALGORITHM.md) for the algorithm (the single source of truth
 ```
 scrabble/        public API: Solver, Move/Play types, DAWG generator, scoring, validation
 board/ rack/ rules/   board grid (+transpose), rack, rulesets (English/Russian/Эрудит)
-internal/        encoding (byte conventions), wordlist, dictdawg, dict, graph
-cmd/builddict/   word list -> serialized DAWG in testdata
+wordlist/ dictdawg/   public word-list parsing and DAWG build/load helpers
+internal/        encoding (byte conventions), dict (committed-DAWG loader), graph
 cmd/stress/      greedy self-play benchmark of the generator
 selfplay/        bag + greedy player + game loop
 ```
 
 ## Setup
 
-```sh
-git submodule update --init            # the dictionaries submodule (SOWPODS, TWL06, …)
-go run ./cmd/builddict                 # build testdata/sowpods.dawg (≈0.2 s, ~730 KB)
-```
-
-`go.mod` carries `replace github.com/iliadenisov/dafsa => ../dafsa`: the solver needs
-dafsa's low-level traversal `Cursor` (see the patch notes in `../dafsa/SCRABBLE_API.md`).
+The committed dictionary DAWGs under `dawg/` (`en_sowpods`, `ru_scrabble`, `ru_erudit`)
+are used directly — no build step. The word-list parsing and DAWG build pipeline lives in
+the separate [`scrabble-dictionary`](https://gitea.iliadenisov.ru/developer/scrabble-dictionary)
+repository, which publishes the DAWG set as a release artifact.
 
 ## Usage
 
 ```go
 rs := rules.English()
-finder, _ := dict.EnglishDAWG()            // loads testdata/sowpods.dawg
+finder, _ := dict.EnglishDAWG()            // loads dawg/en_sowpods.dawg
 s := scrabble.NewSolver(rs, finder)
 
 b := board.New(rs.Rows, rs.Cols)           // empty board (first move)