chore: sprint cleanup — language unification, parser unification, fossils removal

Several weeks of work accumulated without being committed. Grouped here for
clarity; see CHANGELOG.md [Unreleased] for the user-facing summary.

Highlights
----------

P1 #2 — ISO 639-2/B canonical migration
- New Language VO + LanguageRegistry (alfred/domain/shared/knowledge/).
- iso_languages.yaml as single source of truth for language codes.
- SubtitleKnowledgeBase now delegates lookup to LanguageRegistry; subtitles.yaml
  only declares subtitle-specific tokens (vostfr, vf, vff, …).
- SubtitlePreferences default → ["fre", "eng"]; subtitle filenames written as
  {iso639_2b}.srt (legacy fr.srt still read via alias).
- Scanner: dropped _LANG_KEYWORDS / _SDH_TOKENS / _FORCED_TOKENS /
  SUBTITLE_EXTENSIONS hardcoded dicts.
- Fixed: 'hi' token no longer marks SDH (conflicted with Hindi alias).
- Added settings.min_movie_size_bytes (was a module constant).

P1 #3 — Release parser unification + data-driven tokenizer
- parse_release() is now the single source of truth for release-name parsing.
- alfred/knowledge/release/separators.yaml declares the token separators used
  by the tokenizer (., space, [, ], (, ), _). New conventions can be added
  without code changes.
- Tokenizer now splits on any configured separator instead of name.split('.').
  Releases like 'The Father (2020) [1080p] [WEBRip] [5.1] [YTS.MX]' parse via
  the direct path without sanitization fallback.
- Site-tag extraction always runs first; well-formedness only rejects truly
  forbidden chars.
- _parse_season_episode() extended with NxNN / NxNNxNN alt forms.
- Removed dead helpers: _sanitize, _normalize.

Domain cleanup
- Deleted fossil services with zero production callers:
    alfred/domain/movies/services.py
    alfred/domain/tv_shows/services.py
    alfred/domain/subtitles/services.py (replaced by subtitles/services/ package)
    alfred/domain/subtitles/repositories.py
- Split monolithic subtitle services into a package (identifier, matcher,
  placer, pattern_detector, utils) + dedicated knowledge/ package.
- MediaInfo split into dedicated package (alfred/domain/shared/media/:
  audio, video, subtitle, info, matching).

Persistence cleanup
- Removed dead JSON repositories (movie/subtitle/tvshow_repository.py).

Tests
- Major expansion of the test suite organized to mirror the source tree.
- Removed obsolete *_edge_cases test files superseded by structured tests.
- Suite: 990 passed, 8 skipped.

Misc
- .gitignore: exclude env_backup/ and *.bak.
- Adjustments across agent/llm, app.py, application/filesystem, and
  infrastructure/filesystem to align with the new domain layout.

tests/test_agent.py

@@ -1,4 +1,21 @@
-"""Tests for the Agent."""
+"""Tests for ``alfred.agent.agent.Agent`` — the LLM orchestration layer.
+
+Covers the public agent surface used by the FastAPI handlers:
+
+- **Construction** — ``Agent(settings, llm, max_tool_iterations)`` wires the
+  prompt builder, the tool registry, and the in-memory tool catalogue.
+- **Tool execution** — ``_execute_tool_call`` parses an OpenAI-shaped
+  tool-call dict, validates the tool exists and is in scope for the current
+  workflow, executes it, and surfaces errors as structured dicts.
+- **Step loop** — ``step(user_input)`` records the user message, builds the
+  system prompt, runs the LLM/tool loop up to ``max_tool_iterations``, and
+  returns the final assistant text.
+
+These tests use the current component-based LTM API
+(``memory.ltm.workspace.download``, ``memory.ltm.library_paths.set(...)``).
+The legacy flat attributes (``download_folder``, ``movie_folder``, …) no
+longer exist.
+"""
 
 from unittest.mock import Mock
 
@@ -49,7 +66,7 @@ class TestExecuteToolCall:
     def test_execute_known_tool(self, memory, mock_settings, mock_llm, real_folder):
         """Should execute known tool."""
         agent = Agent(settings=mock_settings, llm=mock_llm)
-        memory.ltm.download_folder = str(real_folder["downloads"])
+        memory.ltm.workspace.download = str(real_folder["downloads"])
 
         tool_call = {
             "id": "call_123",
@@ -145,7 +162,7 @@ class TestStep:
         self, memory, mock_settings, mock_llm_with_tool_call, real_folder
     ):
         """Should execute tool and continue."""
-        memory.ltm.download_folder = str(real_folder["downloads"])
+        memory.ltm.workspace.download = str(real_folder["downloads"])
 
         agent = Agent(settings=mock_settings, llm=mock_llm_with_tool_call)
 
@@ -229,8 +246,8 @@ class TestAgentIntegration:
 
     def test_multiple_tool_calls(self, memory, mock_settings, mock_llm, real_folder):
         """Should handle multiple tool calls in sequence."""
-        memory.ltm.download_folder = str(real_folder["downloads"])
-        memory.ltm.movie_folder = str(real_folder["movies"])
+        memory.ltm.workspace.download = str(real_folder["downloads"])
+        memory.ltm.library_paths.set("movies", str(real_folder["movies"]))
 
         call_count = [0]