feat(mcp): tool titles + Connect-with-Claude docs for Connectors Directory readiness (P0-4) (#682)

* feat(mcp): tool titles + Connect-with-Claude docs for Connectors Directory readiness

Add a top-level Tool.title (MCP spec 2025-06-18) to all 92 MCP tools and
flow it through the tools/list serializer for the Claude Connectors
Directory. Trim the ~10 longest tool descriptions toward 180-200 chars
(semantics + agent hints preserved) to partly offset the added bytes, and
raise the payload-size bench ceiling 32K → 36K with headroom reserved for
upcoming Skatteverket tools.

Ship a "Connect with Claude" docs page (OAuth 2.1 connector + npx
gnubok-mcp stdio bridge, sample sandbox prompts, 10-minute reviewer test,
support pointer), wire it into the docs nav, and add a README to the
packages/gnubok-mcp npm bridge. Bump one categorized sandbox business
expense above 4 000 kr so the VAT close-check demo surfaces a high-value
receipt-less expense.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(mcp): restore six spaces lost in the description-trimming pass

Review finding (Greptile P2): the trim deleted single spaces in six tool
descriptions ("Stages foruser", "länkatill", "kundfordran(1510)", …),
producing malformed text in tools/list. All six were pure space deletions
with no token gain — restored verbatim. Swept all 92 descriptions for
residual merge artifacts; the two remaining matches are pre-existing
function-call notation from main.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* docs(compliance): correct BFL citation in seed + mark 4000 kr as app heuristic

Swedish compliance review findings:
- The seed comment cited BFL 5 kap 6§ as requiring verifikat on high-value
  affärshändelser; 6§ governs verifikationens innehåll. Rephrased: BFL 5 kap
  6-7§ require every affärshändelse to be documented — the 4 000 kr cut-off
  is the tool's own heuristic, not a statutory threshold.
- The connect-claude docs read as though 4 000 kr were a legal floor
  (conflatable with the förenklad faktura ceiling, ML 17 kap 26-28§).
  Clarified that BFL requires underlag regardless of amount.

Dismissed as by-design: the gnubok_sk_test_... README placeholders
(standard practice; the prefix schema is already public in llms.txt).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/api/sandbox/seed/route.ts

@@ -504,7 +504,12 @@ export async function POST(request: Request) {
           company_id: companyId,
           date: toDateStr(fiveDaysAgo),
           description: 'SJ BILJETT',
-          amount: -2500,
+          // > 4 000 kr categorized business expense with no attached underlag,
+          // so gnubok_vat_close_check surfaces a non-empty blocker list.
+          // (BFL 5 kap 6–7§ require every affärshändelse to be documented with
+          // underlag; the 4 000 kr cut-off is the tool's own high-value
+          // heuristic, not a statutory threshold.)
+          amount: -4500,
           category: 'expense_travel',
           is_business: true,
           merchant_name: 'SJ',