feat(understand): the takeoff workbook and pipe_takeoff (SECTION 27 opens)

write_workbook builds the user's takeoff workbook from a result: Metraj (rows
with direct, continuity and unassigned lengths split, the allowance as its
own column, routed / unroutable / grand totals), Ozet (by service, diameter
and room), Kontrol (unassigned diameters and unroutable runs with the
reason) and Metodoloji, generated from the result: sources, the length
source and why, the scale-check verdict with its statistics, the units,
every rule and tolerance, and every warning. Headers and sentences in
Turkish, English or Russian. CSV always, one file per sheet; XLSX with
openpyxl, otherwise the xlsx_write refusal naming the office extra while
the CSV files are still written.

pipe_takeoff reads the P&ID and the layout once each (take_snapshot),
computes in a worker thread and never modifies either drawing. Tagged plant
and analysis; the plant pack is the integration task's. Alias record in
English, Turkish and Russian. Inventory regenerated; README snapshot 242
tools (237 advertised); registry snapshot analysis: 13.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FKFStjEFzpGyLq5bMpWxTd

docs/tool-inventory.json

@@ -3,13 +3,13 @@
   "schema_version": 1,
   "package_version": "1.5.1",
   "totals": {
-    "tools": 241,
+    "tools": 242,
     "resources": 8,
     "prompts": 5,
     "groups": 26
   },
   "groups": {
-    "analysis": 12,
+    "analysis": 13,
     "architecture": 12,
     "batch": 3,
     "blocks": 9,
@@ -2524,6 +2524,21 @@
         "readOnlyHint": true
       }
     },
+    {
+      "name": "pipe_takeoff",
+      "group": "analysis",
+      "cost": "safe",
+      "summary": "Pipe takeoff from a P&ID and its layout: rows by room, service and diameter.",
+      "tags": [
+        "analysis",
+        "plant"
+      ],
+      "annotations": {
+        "title": "Plant: Pipe Takeoff",
+        "readOnlyHint": false,
+        "destructiveHint": false
+      }
+    },
     {
       "name": "plot_style_list",
       "group": "page_setup",