fix: bugs #238,#240,#244,#246 + docs #248 update

- #238: Fix spire tab inconsistent state (Max Floor 1 but Floors Cleared 0) by not inflating maxFloorReached on enterSpireMode and preserving it on exitSpireMode
- #240: Fix guardian armor display stray text by extracting stat formatters in SpireSummaryTab
- #244: Improve discipline auto-pause UX with log messages and visual feedback on DisciplineCard
- #246: Fix raw mana exceeding max cap by recomputing maxMana after discipline XP gains
- #248: Update AGENTS.md (remove gitea_get_project_boards, add gitea_start_session, 22 mana types, 8 stores, updated guardian tiers)
- #248: Update README.md (remove Prisma/SQLite refs, update mana types/guardian tiers/discipline counts)
- #248: Update GAME_BRIEFING.md (8 stores, 22 mana types, 64 disciplines, 8-tier guardians, correct code architecture)

AGENTS.md

@@ -24,13 +24,14 @@ git add -A && git commit -m "type: desc" && git push origin master
 
 1. `docs/project-structure.txt`
 2. `docs/dependency-graph.json`
-3. `gitea_get_project_boards` → resume in-progress or pick top todo
-4. `gitea_update_issue_status` → `ai_state: "in-progress"`
-5. Work, log with `gitea_add_comment`, then `gitea_update_issue_status` → `ai_state: "done"`
+3. `gitea_start_session` → retrieve active task registry and issues
+4. Evaluate the queue to find the highest-priority `ai_state: todo` item (or locate an existing `in-progress` task if resuming work)
+5. `gitea_update_issue_status` → `ai_state: "in-progress"`
+6. Work, log with `gitea_add_comment`, then `gitea_update_issue_status` → `ai_state: "done"`
 
 ## Labels
 
-`ai_state: todo` | `in_state: in-progress` | `ai_state: review` | `ai_state: blocked` | `ai_state: done`
+`ai_state: todo` | `ai_state: in-progress` | `ai_state: review` | `ai_state: blocked` | `ai_state: done`
 
 ## Terminal Tool
 
@@ -44,7 +45,7 @@ Use for 3+ sequential independent calls. Zero context from parent — paste ever
 
 - **Stack:** Next.js 16, TS 5, Tailwind 4 + shadcn/ui, Zustand+persist, Vitest, Bun
 - **No backend:** Pure client-side. No Prisma, no database. State persisted to localStorage.
-- **Active stores (7 Zustand stores):**
+- **Active stores (8 Zustand stores):**
   - `useGameStore` — Coordinator/tick pipeline, imports all other stores
   - `useManaStore` — Mana pools, regen, element conversion
   - `useCombatStore` — Spire/floors, combat, spells, achievements
@@ -120,9 +121,9 @@ ManaDrainPerTick = drainBase × (1 + (XP / difficultyFactor)^0.4)
 ### Guardian System
 - Guardians on every 10th floor
 - **Base (floors 10–80):** 7 base elements + Transference, static definitions with unique names
-- **Compound (floors 90–110):** Metal, Sand, Lightning — procedurally named
-- **Exotic (floors 120–140):** Crystal, Stellar, Void — procedurally named
-- **Combination bosses (floor 150+):** Dual-element procedural guardians cycling through 9 element pairs, scaling indefinitely
+- **Tier 2 — Composite (floors 90–160):** 8 composite elements (Metal, Sand, Lightning, Frost, BlackFlame, RadiantFlames, Miasma, ShadowGlass)
+- **Tier 3 — Exotic (floors 170–240):** 6 exotic elements (Crystal, Stellar, Void, Soul, Time, Plasma)
+- **Tier 4+ — Procedural (floors 250+):** Dual-element → multi-element combination bosses cycling through element pairs, scaling indefinitely through 8 tiers
 - HP formula: `floor(5000 × (floor/10) ^ (1.1 + floor/200))`
 - Pact signing: costs raw mana + time, grants permanent boons
 
@@ -165,3 +166,5 @@ Lifesteal/healing, scroll crafting, ascension skills, LabTab, pause mechanics, f
 **Utility (1):** Transference 🔗
 **Composite (8):** Fire+Earth=Metal ⚙️, Earth+Water=Sand ⏳, Fire+Air=Lightning ⚡, Air+Water=Frost ❄️, Dark+Fire=BlackFlame 🌋, Light+Fire=Radiant Flames 🌟, Air+Death=Miasma ☁️, Earth+Dark=Shadow Glass 🖤
 **Exotic (6):** Sand+Sand+Light=Crystal 💎, Plasma+Light+Fire=Stellar ⭐, Dark+Dark+Death=Void 🕳️, Light+Dark+Transference=Soul 💫, Soul+Sand+Transference=Time ⏱️, Lightning+Fire+Transference=Plasma ⚡
+
+**Total: 22 mana types** (7 base + 1 utility + 8 composite + 6 exotic)