refactor(semantics): migrate legacy @TIER to @COMPLEXITY annotations

- Replaced @TIER: TRIVIAL with @COMPLEXITY: 1
- Replaced @TIER: STANDARD with @COMPLEXITY: 3
- Replaced @TIER: CRITICAL with @COMPLEXITY: 5
- Manually elevated specific critical/complex components to levels 2 and 4
- Ignored legacy, specs, and node_modules directories
- Updated generated semantic map

backend/tests/scripts/test_clean_release_cli.py

@@ -1,5 +1,5 @@
 # [DEF:test_clean_release_cli:Module]
-# @TIER: STANDARD
+# @COMPLEXITY: 3
 # @PURPOSE: Smoke tests for the redesigned clean release CLI.
 # @LAYER: Domain
 

backend/tests/scripts/test_clean_release_tui.py

@@ -1,5 +1,5 @@
 # [DEF:backend.tests.scripts.test_clean_release_tui:Module]
-# @TIER: STANDARD
+# @COMPLEXITY: 3
 # @SEMANTICS: tests, tui, clean-release, curses
 # @PURPOSE: Unit tests for the interactive curses TUI of the clean release process.
 # @LAYER: Scripts

backend/tests/scripts/test_clean_release_tui_v2.py

@@ -1,5 +1,5 @@
 # [DEF:test_clean_release_tui_v2:Module]
-# @TIER: STANDARD
+# @COMPLEXITY: 3
 # @PURPOSE: Smoke tests for thin-client TUI action dispatch and blocked transition behavior.
 # @LAYER: Domain
 # @RELATION: TESTS -> backend.src.scripts.clean_release_tui