Business plan draft 0.3 in two versions: Plan A ~180M and Plan B ~225M THB

- One build makes both documents: plan_variant.py switches the
  plan-specific text (pick / is_a / label); build_plan.py writes
  CNX-Vinyl-Business-Plan-A and -B (docx), export_pdf.py exports both PDFs
  with the table of contents filled in. Draft 0.2 (single launch-plant
  plan with contingency) is removed; it stays in the history.
- Plan A: the launch plant with every machine and six cost levers, ~177M
  THB with the ramp-up reserve, no contingency. Plan B: the second Duplex
  at launch, five presses, ~224M THB on the same basis. Each version reads
  as a complete plan with one table comparing it with the other; the
  216M investor-question text is gone, Pheenix is priced at OMS's
  reference plus 20 %.
- Calculator renders in both documents, each from its own preset: the
  plant at a glance (Figure 4), the budget check (Figure 5) and ten years
  of cash (Figure 6), in docs/renders/calculator/.
- Calculator budget card: the verdict and third KPI now name the tightest
  budget the midpoint fits (Plan A: 3.3M to spare under 180M; Plan B:
  0.8M under 225M) instead of always 225M.
- Fixes: CD replication cross-references point to section 4.10; the
  blended price in section 3.3 and roadmap item 1 is 3.76 to 5.27 USD at
  60 % specials (3.50 to 4.60 at a standard-heavy mix).

docs/fleet-calculator.html

@@ -3743,14 +3743,15 @@ function renderBudget(e) {
       `<div class="bgap">against ${M(B1)}: ${gap(tot, B1)} · against ${M(B2)}: ${gap(tot, B2)}</div>`;
   }).join("");
   const mid = V[1], mt = mid.cap + mid.res, rLo = cx.res.lo * fx, rHi = cx.res.hi * fx;
+  const tgt = mt <= B1 ? B1 : B2;   // the tightest budget the midpoint fits (Plan A: 180M, Plan B: 225M)
   $("budK").innerHTML = kpi(M(mid.cap) + " THB", `investment at the midpoint, ${cx.ctgIn ? "contingency included" : "without contingency"}`) +
     kpi(`${M(mid.cap + rLo)} to ${M(mid.cap + rHi)}`, `THB with the ramp-up reserve (${M(rLo)} to ${M(rHi)})`) +
-    kpi(mt <= B2 ? M(B2 - mt) : "+" + M(mt - B2), `${mt <= B2 ? "to spare under" : "over"} ${M(B2)} THB at the midpoint${inB ? ", reserve included" : ""}`);
-  const verdict = mt <= B2 ? `Mid fits ${M(B2)} with ${M(B2 - mt)} to spare` : `Mid is ${M(mt - B2)} over ${M(B2)}`;
+    kpi(mt <= tgt ? M(tgt - mt) : "+" + M(mt - B2), `${mt <= tgt ? "to spare under" : "over"} ${M(tgt)} THB at the midpoint${inB ? ", reserve included" : ""}`);
+  const verdict = mt <= tgt ? `Mid fits ${M(tgt)} with ${M(tgt - mt)} to spare` : `Mid is ${M(mt - B2)} over ${M(B2)}`;
   const detail = inB
     ? `the investment ${M(mid.cap)} plus the ramp-up reserve, ${M(mid.cap + rLo)} to ${M(mid.cap + rHi)} THB with the reserve at ${M(rLo)} to ${M(rHi)}`
     : `the investment ${M(mid.cap)} THB without the reserve; with it, ${M(mid.cap + rLo)} to ${M(mid.cap + rHi)}`;
-  const vs180 = mt <= B1 ? `it fits ${M(B1)} too, with ${M(B1 - mt)} to spare` : `against ${M(B1)} it is ${M(mt - B1)} over`;
+  const vs180 = mt <= B1 ? `against ${M(B2)} it has ${M(B2 - mt)} to spare` : `against ${M(B1)} it is ${M(mt - B1)} over`;
   $("budV").innerHTML = `<div class="flag ${mt <= B2 ? "ok" : "bad"}"><b>${verdict}</b>: ${detail}; ${vs180}. ` +
     `The low end is ${M(V[0].cap + V[0].res)}, the high end ${M(V[2].cap + V[2].res)} THB.</div>`;
 }