fix(peppol): say Peppol send is gated per company, never absent (#546) (#2021)

Peppol sending has been live since #1780 behind a per-company access grant, but the MCP skills, the swedish-invoice-compliance atom, docs/PEPPOL_FOUNDATION.md and the v1 :send / :mark-sent descriptions still told agents it did not exist. Every text now says gated per company (requested under Installningar > Fakturering) and keeps the restrictions explicit: aktiebolag senders, standard invoices only, Swedish org-number buyers, no MCP or v1 Peppol send verb yet, :mark-sent as the recovery step when a network-accepted send fails issuance. The skills guard test pins the truthful claim across all surfaces. Includes the regenerated agent_atom_registry seeds and skills/accounted-api references. Refs #546

skills/accounted-api/references/invoices.md

@@ -529,9 +529,9 @@ Example response `200`:
 **Transition a draft invoice to sent (without emailing).**
 `scope:invoices:write · risk:medium · idempotent · dry-run`
 
-Marks a draft invoice as sent: for invoices delivered outside Accounted (Peppol, postal, manual email). Allocates the F-series invoice_number atomically (ML 17 kap 24§ p.2). When the company books at issue (faktureringsmetoden without defer_invoice_booking), also posts the invoice journal entry (Debit AR 1510 / Credit revenue + output VAT). Emits invoice.sent. Idempotent and dry-runnable. The companion :send action (PR-B-2b-3) adds PDF rendering and email delivery on top of this same flow.
+Marks a draft invoice as sent: for invoices delivered outside Accounted (an external e-invoice provider, postal, manual email). Not needed after a successful dashboard Peppol send: that flow issues the invoice itself. If the dashboard reports that the invoice was sent via Peppol but could not be marked as sent (the send response carried issuance.ok=false and the invoice is still in draft), :mark-sent is the documented recovery and completes the issuance; a number already allocated is reused, never consumed twice. Peppol sending lives in the dashboard invoice page behind a per-company access grant (requested under Inställningar > Fakturering (Settings > Invoicing); aktiebolag senders, standard invoices only, Swedish org-number buyers whose org number is not a personnummer, SEK with taxable Swedish VAT at 6/12/25 % only, no ROT/RUT deductions); a v1 or MCP Peppol send action is not yet available. Allocates the F-series invoice_number atomically (ML 17 kap 24§ p.2). When the company books at issue (faktureringsmetoden without defer_invoice_booking), also posts the invoice journal entry (Debit AR 1510 / Credit revenue + output VAT). Emits invoice.sent. Idempotent and dry-runnable. The companion :send action (PR-B-2b-3) adds PDF rendering and email delivery on top of this same flow.
 
-**Use when:** You delivered the invoice through a channel other than Accounted's email (Peppol, postal, your own SMTP) and need to record it as sent so the F-series number is allocated and the journal entry is posted.
+**Use when:** You delivered the invoice through a channel other than Accounted's email or a successful dashboard Peppol send (an external e-invoice provider, postal, your own SMTP) and need to record it as sent so the F-series number is allocated and the journal entry is posted; or a dashboard Peppol send was accepted by the network but reported that the invoice could not be marked as sent.
 **Do not use for:** Sending the invoice via Accounted email: use :send (PR-B-2b-3) for that. Marking an already-sent invoice as paid: use :mark-paid (PR-B-2b-2).
 
 **Pitfalls:**
@@ -616,7 +616,7 @@ Response `200` (`application/pdf`).
 
 The full send pipeline: preflight PDF render → allocate F-series number atomically → final PDF render → email via the email extension (Resend or SMTP; PDF attachment, copy to company) → flip status to sent → post journal entry (real invoice, unless kontantmetoden or defer_invoice_booking) → archive PDF as underlag → emit invoice.sent. Email failure is a hard 502 before state changes; post-email failures surface as warnings but the invoice IS marked sent.
 
-**Use when:** You want Accounted to deliver the invoice to the customer via email. For invoices delivered through another channel (Peppol, postal, own SMTP) use :mark-sent instead.
+**Use when:** You want Accounted to deliver the invoice to the customer via email. Peppol e-invoices are sent from the invoice page in the dashboard (per-company access grant requested under Inställningar > Fakturering (Settings > Invoicing); aktiebolag senders, standard invoices only, Swedish org-number buyers whose org number is not a personnummer, SEK with taxable Swedish VAT at 6/12/25 % only, no ROT/RUT deductions); a v1 or MCP Peppol send action is not yet available. A successful dashboard Peppol send issues the invoice itself, so do not call :mark-sent after it; only if the dashboard reports that the invoice was sent via Peppol but could not be marked as sent does :mark-sent complete the issuance. For invoices delivered through another channel (an external e-invoice provider, postal, own SMTP) use :mark-sent instead.
 **Do not use for:** Re-sending an already-sent invoice (returns 409 INVOICE_UPDATE_NOT_DRAFT). Sending a delivery note (no F-series lifecycle). Sending a credit note (use the :credit endpoint to issue the kreditfaktura; subsequent re-send of the credit note via :mark-sent is the supported path).
 
 **Pitfalls:**