fix(pitch-deck): eliminate SYSTEM_PROMPT placeholder leak and fix liquidity tax ordering

C3: Split SYSTEM_PROMPT into PART1/PART2/PART3 constants; Kernbotschaft #9 and
VERSIONS-ISOLATION now concatenated directly at runtime instead of .replace() — a
whitespace mismatch can no longer cause placeholder text to leak verbatim to the LLM.

I2: Add second liquidity-chain pass (sumAus→ÜBERSCHUSS→rolling balance) after tax rows
(Gewerbesteuer/Körperschaftsteuer) are written to fp_liquiditaet, so first-run LIQUIDITÄT
figures include tax outflows without requiring a second engine invocation.

I6: Warn when loadFpLiquiditaetSummary finds no fp_liquiditaet rows for a named scenario,
surfacing scenario-name mismatches that would otherwise silently return empty context.

I8: Sanitize console.error calls in chat/route.ts (3 sites) and data/route.ts; cap
LiteLLM error body to 200 chars, use (error as Error).message for stream/handler errors.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pitch-deck/lib/finanzplan/engine.ts

@@ -623,6 +623,50 @@ export async function computeFinanzplan(pool: Pool, scenarioId: string): Promise
     liqKSt.values = v
   }
 
+  // Second pass: tax rows (liqGewSt/liqKSt) were written after the rolling balance above.
+  // Recompute Summe AUSZAHLUNGEN → ÜBERSCHUSS chain → rolling balance so taxes are included
+  // even on the first engine run (when tax rows were previously zero).
+  if (sumAus) {
+    const s = emptyMonthly()
+    for (const row of liquid) {
+      if (row.row_type === 'auszahlung' && row.id !== sumAus.id) {
+        for (let m = 1; m <= MONTHS; m++) s[`m${m}`] += Math.round(row.values[`m${m}`] || 0)
+      }
+    }
+    await pool.query('UPDATE fp_liquiditaet SET values = $1 WHERE id = $2', [JSON.stringify(s), sumAus.id])
+    sumAus.values = s
+  }
+  if (uebVorInv && sumEin && sumAus) {
+    const s = emptyMonthly()
+    for (let m = 1; m <= MONTHS; m++) s[`m${m}`] = Math.round((sumEin.values[`m${m}`] || 0) - (sumAus.values[`m${m}`] || 0))
+    await pool.query('UPDATE fp_liquiditaet SET values = $1 WHERE id = $2', [JSON.stringify(s), uebVorInv.id])
+    uebVorInv.values = s
+  }
+  if (uebVorEnt && uebVorInv && liqInvest) {
+    const s = emptyMonthly()
+    for (let m = 1; m <= MONTHS; m++) s[`m${m}`] = Math.round((uebVorInv.values[`m${m}`] || 0) - (liqInvest.values[`m${m}`] || 0))
+    await pool.query('UPDATE fp_liquiditaet SET values = $1 WHERE id = $2', [JSON.stringify(s), uebVorEnt.id])
+    uebVorEnt.values = s
+  }
+  if (ueberschuss && uebVorEnt && entnahmen) {
+    const s = emptyMonthly()
+    for (let m = 1; m <= MONTHS; m++) s[`m${m}`] = Math.round((uebVorEnt.values[`m${m}`] || 0) - (entnahmen.values[`m${m}`] || 0))
+    await pool.query('UPDATE fp_liquiditaet SET values = $1 WHERE id = $2', [JSON.stringify(s), ueberschuss.id])
+    ueberschuss.values = s
+  }
+  if (kontostand && liquiditaet && ueberschuss) {
+    const ks = emptyMonthly()
+    const lq = emptyMonthly()
+    for (let m = 1; m <= MONTHS; m++) {
+      ks[`m${m}`] = m === 1 ? 0 : Math.round(lq[`m${m - 1}`])
+      lq[`m${m}`] = Math.round(ks[`m${m}`] + (ueberschuss.values[`m${m}`] || 0))
+    }
+    await pool.query('UPDATE fp_liquiditaet SET values = $1 WHERE id = $2', [JSON.stringify(ks), kontostand.id])
+    await pool.query('UPDATE fp_liquiditaet SET values = $1 WHERE id = $2', [JSON.stringify(lq), liquiditaet.id])
+    kontostand.values = ks
+    liquiditaet.values = lq
+  }
+
   return {
     personalkosten: { total_brutto: totalBrutto, total_sozial: totalSozial, total: totalPersonal, positions: personal, headcount },
     investitionen: { total_invest: totalInvest, total_afa: totalAfa, items: invest },