fix: ensure procedural guardian names are unique across floors

- Modified generateGuardianName() in guardian-encounters.ts to add a cycleOffset (floor/50) that shifts prefix selection for the same elements at different 100-floor ranges
- For multi-element names, also shift the title by cycleOffset to further reduce collision chance
- Added regression test guardian-names-unique.test.ts with 7 test cases covering:
  * Previously colliding floors (170/370 crystal, 200/230 exotic convergence, 210/240 astral convergence)
  * All static guardian floors (10-240) uniqueness
  * All procedural guardian floors (250-490) uniqueness
  * Full range (10-490) uniqueness
  * Determinism check
  * Title format validation

Fixes #376

docs/circular-deps.txt

@@ -1,5 +1,5 @@
 # Circular Dependencies
-Generated: 2026-06-12T07:05:52.901Z
+Generated: 2026-06-12T07:45:32.728Z
 Found: 4 circular chain(s) — these MUST be fixed before modifying involved files.
 
 1. 1) data/guardian-encounters.ts > data/guardian-procedural.ts

docs/dependency-graph.json

@@ -1,6 +1,6 @@
 {
   "_meta": {
-    "generated": "2026-06-12T07:05:50.633Z",
+    "generated": "2026-06-12T07:45:30.561Z",
     "description": "Import dependency graph for src/lib/game. Keys are files, values are arrays of files they import.",
     "usage": "To find what a file affects, search for its path in the VALUES. To find what a file depends on, look at its KEY entry."
   },

docs/project-structure.txt

@@ -231,6 +231,7 @@ Mana-Loop/
 │   │   │   │   ├── floor-utils.test.ts
 │   │   │   │   ├── floor-utils.upgraded.test.ts
 │   │   │   │   ├── formatting.test.ts
+│   │   │   │   ├── guardian-names-unique.test.ts
 │   │   │   │   ├── guardian-names.test.ts
 │   │   │   │   ├── hasty-enchanter.test.ts
 │   │   │   │   ├── mana-conversion-component-deduction.test.ts