feat(v-lang): add 10 V-lang connectors (graphdb, objectstore, ldap, vpn, ftp, webdav, opcua, modbus, voip, xmpp)

Phase 2 remaining connectors (graphdb, objectstore, ldap, vpn) receive v.mod files.
Phase 3 start: 6 new connectors (ftp, webdav, opcua, modbus, voip, xmpp) with
full src/main.v, src/abi/Types.idr, v.mod, README.adoc, and contractiles/Trustfile.a2ml.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

v-ecosystem/v-api-interfaces/v-ftp/README.adoc

@@ -0,0 +1,14 @@
+= v-ftp
+// SPDX-License-Identifier: PMPL-1.0-or-later
+
+FTP/FTPS protocol connector for the V-Ecosystem API interfaces layer.
+Implements the File Transfer Protocol (RFC 959) with TLS upgrade via AUTH TLS (RFC 4217).
+Supports active and passive transfer modes, directory listing, file upload/download, rename, and delete operations over the FTP control/data channel architecture.
+
+== Author
+
+Jonathan D.A. Jewell
+
+== Source
+
+`src/ftp.v`

v-ecosystem/v-api-interfaces/v-ftp/contractiles/Trustfile.a2ml

@@ -0,0 +1,20 @@
+# Trustfile.a2ml -- v-ftp
+# SPDX-License-Identifier: PMPL-1.0-or-later
+# Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
+#
+# Contractile trust specification for the v-ftp protocol module.
+# Evaluated by the contractile-cli (must/trust/dust/intend/k9) toolchain.
+
+[trust]
+post-quantum-keys = "pending"
+threat-model = "network-facing-file-transfer"
+formal-verification = "idris2-abi"
+audit-status = "unaudited"
+
+[must]
+invariant-checks = ["input-validation", "path-traversal-prevention", "response-code-validation", "transfer-mode-enforcement", "tls-upgrade-verification"]
+build-contract = "v build src/"
+
+[dust]
+recovery = "reconnect-with-backoff"
+rollback = "abort-transfer-close-data-channel"

v-ecosystem/v-api-interfaces/v-ftp/src/abi/Types.idr

@@ -0,0 +1,56 @@
+-- SPDX-License-Identifier: PMPL-1.0-or-later
+-- Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath)
+--
+-- Idris2 ABI type definitions for the v-ftp protocol.
+-- FTP transfer modes, response codes, directory entry types,
+-- and connection lifecycle states.
+
+module Types
+
+import Data.List
+
+||| FTP transfer mode (active vs passive data channel establishment).
+public export
+data TransferMode : Type where
+  Active  : TransferMode  -- Server connects back to client data port
+  Passive : TransferMode  -- Client connects to server-provided data port
+
+||| FTP representation type for data transfer encoding.
+public export
+data RepresentationType : Type where
+  ASCII  : RepresentationType  -- Text mode with CRLF line endings
+  Binary : RepresentationType  -- Image/binary mode, no conversion
+
+||| FTP connection lifecycle state.
+public export
+data ConnState : Type where
+  Disconnected  : ConnState
+  Connected     : ConnState  -- Control channel established
+  Authenticated : ConnState  -- USER/PASS accepted
+  Transferring  : ConnState  -- Data channel active
+
+||| FTP response code category (first digit per RFC 959).
+public export
+data ResponseCategory : Type where
+  Preliminary   : ResponseCategory  -- 1xx: positive preliminary
+  Completion    : ResponseCategory  -- 2xx: positive completion
+  Intermediate  : ResponseCategory  -- 3xx: positive intermediate
+  TransientNeg  : ResponseCategory  -- 4xx: transient negative
+  PermanentNeg  : ResponseCategory  -- 5xx: permanent negative
+
+||| A parsed FTP server response with numeric code and text message.
+public export
+record FtpResponse where
+  constructor MkFtpResponse
+  code    : Nat
+  message : String
+
+||| Directory entry metadata returned by LIST or MLSD commands.
+public export
+record DirEntry where
+  constructor MkDirEntry
+  name      : String
+  size      : Nat
+  entryType : String   -- "file", "dir", "link"
+  modified  : String   -- ISO 8601 timestamp
+  perms     : String   -- Unix-style permission string