docs: reconcile spec inconsistencies across all documentation

- Fix incursion start day: 5→20 in GAME_BRIEFING.md (matches code constant)
- Fix fabricator discipline count: 2→5 in AGENTS.md
- Fix discipline counts: elemental.ts 22→21, advanced-regen.ts 14→15
- Fix equipment count: 50→43, remove shields, fix catalysts count
- Fix prestige upgrade count: add missing manaWell, manaFlow, pactBinding, pactInterferenceMitigation
- Remove x3 victory multiplier (no victory condition defined yet)
- Update pact persistence: pacts do NOT persist through prestige
- Update elemental matchup tables to match ultimate truth
- Update room type frequencies to match spire-climbing-spec
- Update guardian data tables to use formulas
- Update Tier 3 guardian elements to match guardian-data.ts code
- Add pactBinding + pactInterferenceMitigation to PRESTIGE_DEF constants
- Wire pactInterferenceMitigation into useGameDerived.ts
- Update spire-combat-spec.md Known Gaps table (DoT implemented, melee bypass bug)
- Update invoker-spec.md known issues (all resolved)
- Update golemancy-spec.md status (undergoing redesign)
- Update PrestigeTab test to expect 15 upgrades
- Create Gitea issues #285 (melee defense bypass), #286 (DoT verified), #287 (mana conversion gap)

src/components/game/tabs/PrestigeTab.test.ts

@@ -28,9 +28,9 @@ describe('Tab barrel export', () => {
 // ─── Test: Prestige upgrade definitions ────────────────────────────────────────
 
 describe('Prestige upgrade definitions', () => {
-  it('has exactly 11 prestige upgrades', async () => {
+  it('has exactly 15 prestige upgrades', async () => {
     const { PRESTIGE_DEF } = await import('@/lib/game/constants/prestige');
-    expect(Object.keys(PRESTIGE_DEF).length).toBe(11);
+    expect(Object.keys(PRESTIGE_DEF).length).toBe(15);
   });
 
   it('all upgrades have required fields', async () => {
@@ -43,13 +43,13 @@ describe('Prestige upgrade definitions', () => {
     }
   });
 
-  it('all 11 expected upgrade IDs are present', async () => {
+  it('all 15 expected upgrade IDs are present', async () => {
     const { PRESTIGE_DEF } = await import('@/lib/game/constants/prestige');
     const expectedIds = [
-      'insightAmp', 'spireKey',
+      'manaWell', 'manaFlow', 'insightAmp', 'spireKey',
       'temporalEcho', 'steadyHand', 'ancientKnowledge', 'elementalAttune',
       'spellMemory', 'guardianPact', 'quickStart', 'elemStart',
-      'unlockedManaTypeCapacity',
+      'unlockedManaTypeCapacity', 'pactBinding', 'pactInterferenceMitigation',
     ];
     for (const id of expectedIds) {
       expect(PRESTIGE_DEF[id]).toBeDefined();