fix(pact-system): resolve 5 spec-vs-code discrepancies (DISC-4,6,8,11,12)

- DISC-11: Fix floor 140/150 element composition in guardian-data.ts
  Floor 140 now uses [light, fire, radiantflames] (was [sand, earth, water])
  Floor 150 now uses [air, death, miasma] (was [lightning, fire, air])
- DISC-12: Reconcile spec §7.1 vs §8.2 tables in pact-system-spec.md
  Updated §8.2 to match §7.1 authoritative element mappings
- DISC-4: Deduplicate pact ritual completion logic
  Refactored pact-ritual.ts pipeline to delegate completion to
  prestigeStore.completePactRitual() instead of duplicating state writes
- DISC-6: Add 4 missing boon types to guardians
  critChance (floor 90), manaGain (floor 110), prestigeInsight (floor 200),
  studySpeed (floor 220) — all 12 spec boon types now used
- DISC-8: Add comment clarifying signedPactDetails persistence
  Code already correct (not reset by startNewLoop/resetPrestigeForNewLoop)
- Updated spire-utils.test.ts to match corrected floor 140/150 elements

docs/circular-deps.txt

@@ -1,8 +1,9 @@
 # Circular Dependencies
-Generated: 2026-06-08T18:36:58.404Z
-Found: 1 circular chain(s) — these MUST be fixed before modifying involved files.
+Generated: 2026-06-08T20:08:33.456Z
+Found: 2 circular chain(s) — these MUST be fixed before modifying involved files.
 
 1. 1) stores/golem-combat-actions.ts > stores/golem-combat-helpers.ts
+2. 2) stores/combatStore.ts > stores/combat-descent-actions.ts > stores/attunementStore.ts
 
 ## How to fix
 1. Identify which import in the chain can be extracted to a shared types/utils file.