fix(packaging): move templates/ into decnet/ package so they ship with pip install

The docker build contexts and syslog_bridge.py lived at repo root, which
meant setuptools (include = ["decnet*"]) never shipped them. Agents
installed via `pip install $RELEASE_DIR` got site-packages/decnet/** but no
templates/, so every deploy blew up in deployer._sync_logging_helper with
FileNotFoundError on templates/syslog_bridge.py.

Move templates/ -> decnet/templates/ and declare it as setuptools
package-data. Path resolutions in services/*.py and engine/deployer.py drop
one .parent since templates now lives beside the code. Test fixtures,
bandit exclude path, and coverage omit glob updated to match.

decnet/templates/ldap/server.py

@@ -0,0 +1,149 @@
+#!/usr/bin/env python3
+"""
+LDAPserver.
+Parses BER-encoded BindRequest messages, logs DN and password, returns an
+invalidCredentials error. Logs all interactions as JSON.
+"""
+
+import asyncio
+import os
+from syslog_bridge import syslog_line, write_syslog_file, forward_syslog
+
+NODE_NAME = os.environ.get("NODE_NAME", "ldapserver")
+SERVICE_NAME   = "ldap"
+LOG_TARGET = os.environ.get("LOG_TARGET", "")
+
+
+
+
+def _log(event_type: str, severity: int = 6, **kwargs) -> None:
+    line = syslog_line(SERVICE_NAME, NODE_NAME, event_type, severity, **kwargs)
+    write_syslog_file(line)
+    forward_syslog(line, LOG_TARGET)
+
+
+def _ber_length(data: bytes, pos: int):
+    """Return (length, next_pos)."""
+    b = data[pos]
+    if b < 0x80:
+        return b, pos + 1
+    n = b & 0x7f
+    length = int.from_bytes(data[pos + 1:pos + 1 + n], "big")
+    return length, pos + 1 + n
+
+
+def _ber_string(data: bytes, pos: int):
+    """Skip tag byte, read BER length, return (string, next_pos)."""
+    pos += 1  # skip tag
+    length, pos = _ber_length(data, pos)
+    return data[pos:pos + length].decode(errors="replace"), pos + length
+
+
+def _parse_bind_request(msg: bytes):
+    """Best-effort extraction of (dn, password) from a raw LDAPMessage."""
+    try:
+        pos = 0
+        # LDAPMessage SEQUENCE
+        assert msg[pos] == 0x30  # nosec B101
+        pos += 1
+        _, pos = _ber_length(msg, pos)
+        # messageID INTEGER
+        assert msg[pos] == 0x02  # nosec B101
+        pos += 1
+        id_len, pos = _ber_length(msg, pos)
+        pos += id_len
+        # BindRequest [APPLICATION 0]
+        assert msg[pos] == 0x60  # nosec B101
+        pos += 1
+        _, pos = _ber_length(msg, pos)
+        # version INTEGER
+        assert msg[pos] == 0x02  # nosec B101
+        pos += 1
+        v_len, pos = _ber_length(msg, pos)
+        pos += v_len
+        # name LDAPDN (OCTET STRING)
+        dn, pos = _ber_string(msg, pos)
+        # authentication CHOICE — simple [0] OCTET STRING
+        if msg[pos] == 0x80:
+            pos += 1
+            pw_len, pos = _ber_length(msg, pos)
+            password = msg[pos:pos + pw_len].decode(errors="replace")
+        else:
+            password = "<sasl_or_unknown>"  # nosec B105
+        return dn, password
+    except Exception:
+        return "<parse_error>", "<parse_error>"
+
+
+def _bind_error_response(message_id: int) -> bytes:
+    # BindResponse: resultCode=49 (invalidCredentials), matchedDN="", errorMessage=""
+    result_code = bytes([0x0a, 0x01, 0x31])   # ENUMERATED 49
+    matched_dn = bytes([0x04, 0x00])           # empty OCTET STRING
+    error_msg  = bytes([0x04, 0x00])           # empty OCTET STRING
+    bind_resp_body = result_code + matched_dn + error_msg
+    bind_resp = bytes([0x61, len(bind_resp_body)]) + bind_resp_body
+
+    msg_id_enc = bytes([0x02, 0x01, message_id & 0xff])
+    ldap_msg_body = msg_id_enc + bind_resp
+    return bytes([0x30, len(ldap_msg_body)]) + ldap_msg_body
+
+
+class LDAPProtocol(asyncio.Protocol):
+    def __init__(self):
+        self._transport = None
+        self._peer = None
+        self._buf = b""
+
+    def connection_made(self, transport):
+        self._transport = transport
+        self._peer = transport.get_extra_info("peername", ("?", 0))
+        _log("connect", src=self._peer[0], src_port=self._peer[1])
+
+    def data_received(self, data):
+        self._buf += data
+        self._process()
+
+    def _process(self):
+        while len(self._buf) >= 2:
+            if self._buf[0] != 0x30:
+                self._buf = b""
+                return
+            if self._buf[1] < 0x80:
+                msg_len = self._buf[1] + 2
+            elif self._buf[1] == 0x81:
+                if len(self._buf) < 3:
+                    return
+                msg_len = self._buf[2] + 3
+            else:
+                self._buf = b""
+                return
+            if len(self._buf) < msg_len:
+                return
+            msg = self._buf[:msg_len]
+            self._buf = self._buf[msg_len:]
+            self._handle_message(msg)
+
+    def _handle_message(self, msg: bytes):
+        # Extract messageID for the response
+        try:
+            message_id = msg[4] if len(msg) > 4 else 1
+        except Exception:
+            message_id = 1
+        dn, password = _parse_bind_request(msg)
+        _log("bind", src=self._peer[0], dn=dn, password=password)
+        self._transport.write(_bind_error_response(message_id))
+
+    def connection_lost(self, exc):
+        _log("disconnect", src=self._peer[0] if self._peer else "?")
+
+
+async def main():
+    _log("startup", msg=f"LDAP server starting as {NODE_NAME}")
+    loop = asyncio.get_running_loop()
+    server = await loop.create_server(LDAPProtocol, "0.0.0.0", 389)  # nosec B104
+    async with server:
+        await server.serve_forever()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())