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>

lib/docs/nav.ts

@@ -27,6 +27,7 @@ export const DOCS_NAV: DocsNavSection[] = [
       { label: 'Introduction', href: '/docs/api', summary: 'What the Accounted REST API is and how to authenticate.' },
       { label: 'Quickstart', href: '/docs/api/cookbook/quickstart', summary: 'Send your first invoice in five minutes.' },
       { label: 'Authentication', href: '/docs/api#authentication', summary: 'API keys, scopes, test mode.' },
+      { label: 'Connect with Claude', href: '/docs/api/connect-claude', summary: 'Connect Claude via the MCP server — OAuth connector or npx gnubok-mcp bridge.' },
     ],
   },
   {